Went to pick up a younger cousin from work last night, she works in a large supermarket that is 24 hours most of the week but closes at midnight for sunday trading laws on a Saturday.
She was fairly late coming out after her shift ended at midnight, I asked why and she said that it was because someone wanted her to open a till for them after midnight once they'd all been closed down and wouldn't take no for an answer. She had to get security to remove them because they were threatening towards her, because it's illegal for her to open a till after midnight.
Personally I think they're entitled knobs. Closing time is closing time. It doesn't mean that if you're in the shop before closing then you get to go do your big shop and everyone has to wait around for you to finish.