A few years ago, my local grocery chain remodeled three checkout lanes. They were turned into six self-checkout stations. Now, on any given day, there will be more people standing in line waiting for a self-checkout station than there are people being processed through the traditional checkout lanes. It isn’t particularly efficient. The computers have glitches, you can’t pay for alcohol at self-checkout, and if you set your item down incorrectly in the bag, all hell breaks loose.
What the store really needs is a couple of iPads and some friendly checkers who know how to use them.