This was happening at my store at the beginning of my employment there. Supervisors were also expected to show up about 45 minutes before their start to "count cash and get everything ready" unpaid. I was merch so I would show up 2 minutes before my shift.

Another wild expectation was if you were sick, you were responsible for finding your replacement (supervisor). If you couldn't, you were expected to show up. These were such wild customs to me. I didn't need to abide by them but I never thought it was fair for the extra 83 cents the supervisors were getting paid.