Just started a new job, already am completely overwhelmed

I (17F) started a fast food job about a month ago, and while I really love the people there, the hours have gotten progressively worse. It went from 15 hour weeks to me now working 28 hours a week (in the form of 4 closing shifts). I made it clear when I joined that 20 hours was my max, but it’s gotten worse and I don’t know how to go about asking for less hours, and at what point it’s best to just call it quits. With school having started this week, I already know that my 6 AP classes are not going to balance out well against my job, but again, I don’t know how long I should wait to see if it gets better, seeing as I’ve only had this job for a month.

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