Is this normal as a cashier?

Ok so im 16 and just got hired as a cashier i didnt even apply my friends sister works at another store this Indian guy owns so we both got insta accepted as cashiers but anyway is there a rule or something on limits cashiers have to do? For example usually we have 2 other workers but today we had one other worker (he doesn’t speak english actually all of my coworkers are from india and speak 5% english) and I was literally tasked with everything besides making the wings and had to cook and make fries, take orders, and pack literally everything while it was busy as hell is this normal or can I contact someone about this also they said I have to work 3:30 to 12 on school nights which I think is illegal