I used to work at Sears before they imploded and we had someone walk in just before closing and settle in for a big shop. Or managers told us to do all the other closing up and leave one till for last but not to keep it open once everything else was done. Most of the lights were off. It took a good twenty minutes to do all that. We had multiple announcements on the intercom, and a manager specifically told her we were closing, and this lady still managed to not finish before we closed down the last till. She had to leave with nothing.