Our local big Sainsbury's supermarket has installed airport-style barriers everywhere and you now have to queue and scan your receipt to get out.
As a kid, I always wanted to live in some science fiction futuristic society. I never thought that I'd actually grow up to live somewhere where I had to scan to get out a supermarket only to be under threat of attack by ravaging killer dogs.
I don't know. There's always a queue because the scanner wasn't reading the receipts properly and wlll only accept the receipt scanned once. We had to be helped through by a shopworker who checked we had paid. It was super-frustrating to wait and the gates were too strong to push through. We've just stopped going to Sainsbury's now and just use our nearest Aldi.