In the RV, a emergency key is wire tied to the frame in a place only I know.
So far, nearly two years and the Keyless lock is still working great on the same High End Duracell battery. It has never malfunctioned.
Grandkids can come and go and lock and unlock the door without a key. When we are camping and at the beach or the pool, keys are a nuisance.
At home, using Keyless locks on the house, I can give a neighbor a code to check on things when we are away, and change the code in one minute when we return. Way better than handing out keys.
And if you have 8 locks keyed alike, that's a lot of locks to change should you lose your keys or for some other reason need to change the locks.