I drove cars when we had to physically unlock each door, with a key, no great hardship. Then we got central locking, only had to unlock the driver's door with the key, that was nice didn't have to walk round the car car unlocking doors, or reaching across the inside to do the same. Then came remote central locking, very nice, click the fob, car unlocked by the time one had walked up to it. Now we have keyless entry, car unlocked just by pulling the door open, without needing to find the remote fob (which pocket/bag was it in?).
What's common to all? Pulling the door open. The operation has been reduced to it's basic requirement. That is until we have keyless, powered entry!
Oh, also common to all, cars were always stolen and stolen more easily when we had keys,,,