How Many Ways Can You Unlock a Smart Door Lock? (And Which One Should You Actually Use?)

Rohan’s mother called him at 8:47 AM on a Wednesday.

The plumber was at the door. Rohan was stuck in traffic on the expressway, 40 minutes away. His wife had already left for work. His mother — 68 years old, not entirely comfortable with smartphones — was standing inside the apartment, unsure what to do.

“Just open the door, Amma.”

“But what if he’s not the real plumber?”

She had a point.

This is the moment most people don’t think about when they buy a door lock. They think about themselves — their fingerprint, their convenience, their morning routine. They don’t think about every other person who will ever need to get in or out of their home, under circumstances nobody planned for.

A smart door lock doesn’t just unlock for you. It unlocks differently for every situation life throws at it. Here’s what that actually looks like.

 

- Fingerprint — Your Personal Fast Lane

In 2023, a study found that the average person spends 5 minutes a day looking for their keys over a lifetime — that’s roughly 60 hours a year. A fingerprint sensor eliminates that entirely.

You walk up. You touch. You’re in. Groceries in both hands, raining outside, running late — doesn’t matter. Your fingerprint is the only credential that is always on you, can never be forgotten, and belongs to exactly one person on the planet.

It’s the method most people use 90% of the time. The other 10% is where the rest of this list earns its place.

- PIN Code — For Everyone Who Isn’t You

Back to Rohan’s problem. The solution, that Wednesday morning, was a PIN.

He called his mother, gave her a 6-digit code to share with the plumber, and told her she could change it — or he would — the moment the job was done. No key exchanged hands. No fingerprint registered permanently. No argument with a 68-year-old about smartphone apps.

PIN codes exist for the cook who arrives at 6:30 AM, the cousin visiting for the weekend, the repair person you’ll never see again. Share it, use it, change it. The better locks also come with anti-peep technology — you type random extra digits before or after your actual code, so even if someone’s watching over your shoulder, what they see on the keypad doesn’t give them a way in.

- RFID Card — The Tap That Just Works

There’s a reason every premium hotel in the world uses a card instead of a PIN or a biometric. It’s fast, it’s reliable, and it requires nothing from the person holding it except to tap and walk in.

For an 8-year-old coming home from school alone, a card works better than a PIN they’ll forget and better than a fingerprint sensor that confuses them. For an elderly parent who finds apps stressful and PINs easy to mix up, a card is the right tool. Physical, tangible, always in the same pocket.

If it’s lost, you deactivate it directly from the lock. Thirty seconds. Done.

- Mobile App — The One That’s With You Even When You Aren’t

A 2024 survey found that 1 in 3 Indian homeowners had at least one incident where they needed to let someone into their home while they were not physically present. Delivery, domestic help, a relative arriving early — these aren’t rare events.

The app turns your phone into a key that works from anywhere. You get a notification, you see who’s there, you open the door remotely. You can also pull up a full log — every entry, every exit, every method used, timestamped — which is useful for peace of mind and occasionally very important for other reasons.

-  Face ID — The Door That Recognises You

The 3D Face ID on advanced smart locks isn’t the same as your phone’s face unlock. It maps your face in three dimensions using depth sensors, which means a photograph held up to the camera won’t open your door. It works in low light, at slightly different angles, even with glasses on.

For family members who struggle with other access methods — or for the moment you come home with both hands completely full and no intention of stopping — Face ID is the closest thing a door has ever come to reading your mind.

- Palm Vein Recognition — The One That Sounds Like Science Fiction (But Isn’t)

Here’s a fact most people don’t know: the vein pattern beneath your palm is more unique than your fingerprint. It can’t be seen with the naked eye, can’t be lifted off a surface, can’t be replicated from a photograph.

Near-infrared light reads it through your skin. You hover your hand. The door opens.

This technology exists in the Onetouch OT 630 Pro — a lock you can install on your apartment door today. It’s the highest level of biometric security available in a residential lock anywhere in India right now. Most high-security offices don’t have it. Your home can.

- Mechanical Key — The Boring One That Might Save Your Night

Power cuts happen. Batteries die. Apps go down. It’s never convenient and it’s always late at night.

The mechanical key doesn’t care. It works in a blackout, it works when your phone is dead, it works when everything else has decided today is not its day. It lives in a drawer. You use it twice a year. It earns its place every single day just by existing.

The Real Answer to “Which One Should I Use?”

All of them — for different people, different moments, different days.

A home isn’t just one person with one routine. It’s a grandmother who doesn’t use apps, a kid who loses things, a spouse with different habits, a parade of delivery people, plumbers, and guests that no one fully planned for. A smart lock with 7 access methods isn’t overengineered — it’s just honest about how complicated real life actually is.

That’s what the right access method actually does. It removes a problem so quietly that you forget it was ever there.

 

Frequently Asked Questions

- How many ways can you unlock a smart door lock?

Between 5 and 7, depending on the model. Entry-level locks typically offer fingerprint, PIN, RFID card, and mechanical key. Premium models like the Onetouch OT 630 Pro offer all seven — Palm Vein, Face ID, Fingerprint, PIN, RFID, App, and Mechanical Key.

- Which access method is the most secure?

Palm vein recognition is currently the hardest to replicate since it reads vein patterns beneath the skin. For everyday home use though, a combination of fingerprint, anti-peeping PIN, and app monitoring covers most situations very well.

- What if my fingerprint doesn’t work or I forget my PIN?

You always have fallback options — RFID card, mobile app, or mechanical key. A good smart lock never leaves you dependent on a single method.

- Do all these methods need internet to work?

No. Fingerprint, PIN, RFID, Face ID, Palm Vein, and mechanical key all work offline. Internet is only needed for remote app access and real-time entry notifications.

- Which Onetouch lock has the most access methods?

The OT 630 Pro — 7 access methods, a built-in video door phone, and a 4-inch indoor monitoring screen. It’s the most complete smart lock in the Onetouch range.