They've been experimenting with self-checkouts for decades. When I was a kid, I remember being in a store with my grandma, waiting in line to pay, and an employee kept trying to entice those in the line to come over and try the self-checkouts.

She asked my grandma a few times before my grandma, a proud union supporter, snapped "I want a person to ring me up. I'm trying to save your JOB, young lady!"

And the young woman stopped asking my grandma.