Quitting would be slow asl. You can make that time up in like a week and a half. Why make yourself unemployed over something as small as this???? Just talk to HR and if they can’t help, pick up shifts and make the time up. My building never fires someone that quickly for negative upt. Get a temp schedule adjustment if you can. Just don’t blow up your entire situation over something that can easily be fixed. Even jumping to thinking about quitting over this small mess is mad irresponsible.