"and saves customers from the hassle of having to deal with actual humans..."
I have to say that on the few occasions that I've had key cut, I've always found the staff to be extremely quick and efficient.
Them: "What key do you want cut?"
Me: - holds up key -
Them: "How many do you want?"
Them: - takes key, selects two blanks from the rack behind, mounts key in cutting machine, cuts 1st blank, cuts 2nd blank.
Them: "That'll be £7".
Done in a few short minutes. My kind of human interaction.