I know in Japan for instance, there’s a unmanned store where you can buy things with the only thing meeting you near the front entrance & exit is self checkout. It’s a trust based system where you walk in select what you want (without locking any essential or mundane item behind plexiglass), as in they depend on individuals having common sense on not stealing paying via a “honesty box” based on a honor system.
I’ve seen some unattended stores in the US, kinda. There’s a person there, but they don’t ring people up full time. Usually they’re cleaning or stocking. There’s no honor system, a machine visually scans and weighs your items and rings you up that way. The person only gets involved if they need to check your ID for alcohol sales or if there’s an error with the machine.