Hey Jessie,
I'm really proud of you for telling your mum. There is a good chance that it could go to court, since you are underage. I wouldn't wait until you were eighteen, to be honest. In your state, what he did to you, and what he might do to someone else, is illegal, especially since you did say no.
I know how hard this is, I really do. You might want to tell your manager that this guy is harassing you and other female employees, because that's technically what he's doing. Your manager can help, either by preventing the guy from being there, or by making sure all you girls are safe. It's their job to keep their employees safe.
Take care of yourself, and if you need anything, feel free to
pm me.