Been working there since November 2014 and every day I go in I hate it. Literally the most depressing 7 hours of my life.
The worst part about it is... ok, the worst parts:
5am starts, 6 on a Sunday. This sucks so much, especially when you work weekends (goodbye nights out). Gets worse when 2 weeks before Christmas you have to start at 4am.
Customers treat you like ****. To them, you're some no hoper that will be working there till you're 70 and you're in their way. Some of them are nice, but it's rare and most of them are horrid.
Other staff treat you like ****. You're at the bottom of the food chain, expendable. The night staff (shelf stackers) are just utter *****. They get annoyed because you're essentially undoing the work they've just done, but how can you help that? It's your job to do it. But they don't understand because most of them are 40+ and will be there till they retire.
TL;DR, working there is the first time I've had the urge to actually kill someone.
The best part about working there is that the pay is above average for a part time job in a shop, but if it was any less, it wouldn't be worth the depression.
I think I need to find a new job.
... and the ones that won't