I think minors are not allowed to work after 10pm where I am at.
Tell your CSM that you are a minor(if you are) and that you need to leave at 11 pm if that is the time for your state. Let someone know that you are leaving. The store could get in trouble if they make you stay after 11.
Next time, let your store manager know when the schedule gets posted about the time issue.
Are you saying this because your store closes at 11 or something? If they schedule you to work until 11:45 you'll be working until 11:45 and your mom coming to pick you up won't make a difference. If it's because the store closes at 11, well people work overnight so you'd just be leaving after hours.