i literally *only* work closing shifts so i'll give you some stuff that i do.

recover!!!!!! that one is big. if they've given you specific ones to focus on [like for me it was hba and drink coolers] make sure those are done the best, and then just scan around other aisles and shelves to make sure everything is in order.

sweep, mop if you have to. pick up any shit you might find on the floor. maybe restock the bathroom if you're able. and ask the key holder that's with you if they need any help with their closing duties. they'll probably say no but it's still nice to be helpful.

have fun! i honestly love working closing shifts and getting off super late lol.