No big deal, we own a condo and the locks a keycard which you need for other parts of the project if they had to they can enter our unit also the smoke alarm is linked to the security office they know exactly where it's gone off,
We used to have a villa that had one of them key pads, it's easy to change the codes I used to change regular the one we had it used to burn through batteries,
I have bunches of keys for other properties that are rented out and the owners are not here, tenants have been known to get locked out and lose keys, we do take a deposit for the keys, plus it's a pain in the backside getting new keys cut,