Dollar General: for a smaller company, they have stores all over the place, and it seems they'll hire just about anybody who meets the bare minimum requirements for the work.
That makes it a very easy job to get, and it does offer a good way to get job experience. During my time at Dollar General, I learned what it will be like to have a bank account, work with other people, have hourly wage, and work customer service. I learned skills that even now, are like riding a bike, they just stick with you.
That being said, I do have my own personal issues, and though they may be specific to my situation and location, they were a bit discouraging.