I’m going to second Time.turner. A lot of low-skill retail jobs (including stocking) use “flex scheduling,” and in areas with reasonably high unemployment, if you don’t make yourself available to work at any time, any day, you won’t get scheduled for any hours at all. Or you’ll get one or two, because they won’t fire you, where you could get unemployment. But it’s nothing. You have to offer 100% availability, the full 168 hours that exist in a week, to get paid around minimum wage for maybe 30 of those hours. Trying to go to school or arrange childcare is a nightmare. It shouldn’t be legal, but it is in most places.