The Problem You Solve Is More Important Than The Code You Write
Fagner Brack

I fully agree. For the bluetooth unlock still, I thnk many people would not like at all a system that unlock anytime they are within 1 meter of the door. That could be used to get entrance when the owner of the flat doesn’t want to allow it simply because he his nearby, for example on the other side of the door. People may also want to ensure they are authenticated before access is granted and so ask for the phone to be unlocked.

As if that solution that rely only on distance is acceptable would depend a lot of what it unlock to me. It is a classical conveniance vs security tradeof.