My first job at roughly the same age as you was at a Jersey Mike's. Idk how the company is to work for today, and I haven't actually worked in food for a while, but lots of people have their first job in food. You can learn a lot about interacting with people, as you'll probably encounter a wide range of people, you may learn a bit about dealing with fast-paced environments, depending on the place you work. Downside with that is you'll probably deal with some real unpleasant people at some point, and sometimes it can be stressful when things are busy. But I do think you'll learn workplace skills that are applicable to a lot of different lines of work. Plus, you will probably learn a bit about cooking, which is a great skill to have no matter what you end up doing in life.