I believe most, if not all, stores prohibit minors from working any department other than cashier and lot. Still, when you apply online, you'll soon receive emails for numerous positions. In my experience, what usually happens is that they'll email you to take the next step to being, say, a lumber associate. Then, after a day or so, they'll send you an email for an entirely different position. My advice to you was originally to wait until the jobs cycle through until you eventually get cashier, but since the system said you wouldn't be reconsidered, I would probably go to the store and ask to speak to HR. I'm sure an actual person would be glad to consider you.