This restaurant doesn't accept middle school students.

Hello, in fact, regular shops don't accept child labor, because you are under 18 years old, so many shops don't accept it, but if you really want to get some exercise, you can go to some small shops opened by individuals. You can explain the situation to the owner. It won't take long. Usually this kind of shop has recruitment information hanging outside. You can go and have a look. If your ID card really doesn't work, you can consider borrowing your brother's. I hope it works for you.