This. And I do their work a lot more slowly because it's not my regular job, and I actually already had to do some of the work (getting the items out of my trolley and onto the conveyor). Now I stand there forever fumbling with barcodes, trying to get bags to stay open, switching between getting items out of the trolley and scanning. The old checkout system is so much more efficient when you are buying anything more than a couple of items at a time.

Do you consider all forms of "self-service" to not be automation of a job that previously required an additional human?

Like checking in at the airport via kiosk/app for example. Do you consider that to be "doing the work" of the desk clerk? Or say ordering at a restaurant by scanning a QR code, in both cases I have to look at the menu, decide what I want, and input my order into a system. But with the QR code there's no longer a human necessary.

Many "productivity improvements" in the modern era are just externalizing the problem. It's like saying I automated recycling by dumping all my unsorted stuff in my neighbors bin.