[qkhhly]

I have a better idea: using a QR code as your door key.

* Install a lock that does not have any external mechanism to unlock it. No key holes, no password pad, nothing. So there will be no lock picking in any way.

* Use your peep hole as a camera.

* Show a QR code to said camera.

* Door unlocks if QR code is correct.

[otterley]

What's the failsafe mode? (e.g. battery is dead, mechanism fails, etc.)

[xnyan]

Kicking the door in is surprisingly easy in the US where most doors are framed in soft pine, if that does not work an angle grinder and a sufficient supply of discs can (eventually) cut through anything.

[ramon156]

In theory, if you don't lose your key, locks work indefinitely.

Battery-powered locks.. well.. they die a lot more than 0 times

[qkhhly]

what is the failsafe mode if you lost all your keys, or forget your password, or fingerprint reader runs out of battery? same thing applies here.