I thought the same until I stayed at a HomeAway property where they used the electronic locks. They defined an entry PIN for me for the duration of the stay, pr

I thought the same until I stayed at a HomeAway property where they used the electronic locks. They defined an entry PIN for me for the duration of the stay, presumably revoking it after I was gone. This enabled me to come and go without worrying about their keys, and without them needing to change the locks after I was gone. While the lock was quite finicky, it worked well enough for the purpose that I surmised for it.