Well most stores won’t open the doors if they aren’t open. I believe he just dropped in at a bad time, which unfortunately does happen in business that keeps their doors open 24/7 (Which most bigger Walmarts do), however it is unfortunate he was not warned by someone prior to going to the checkouts. I mean granted in the middle of the night there won’t be a ton of workers but surely someone could have told him. If they were closed they should have locked the doors and put up a sign, or at least have an older employee stand at the doors and warn people coming in, which is what my Walmart would have done.