Comment by HankStallone

The small-town Dollar General I visit turned the second, usually-idle checkout lane into a self-checkout about a year ago. A few months later, they turned it off and haven't used it since.

I suspect it just didn't make sense to have an employee outside smoking or sitting in the break room scrolling on a phone while the customers went through and maybe paid for their goods, when that employee could simply run the checkout counter.