How about a remote door key for your apartment where you get to unlock the door when you are few steps away? Something like a typical car remote key, just that I am thinking of putting the same technology on an apartment door lock.
Did I lock the door when I left the house?
Probably this remote key can do a auto-lock when it is about a (or few) meter away from the lock. There are already such technology for car lock/alarm, which can be considered here as well.
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