Why that's their "Customer Service" counter! You can get your film developed there, buy lottery tickets, and I'm sure many other exciting things. Just don't try to pay for a purchase there, as I was snapped at when I brought a few products there due to the long check-out lines and was told that it's not a check-out.
TIP: If the check-out lines are long, there is a cashier at the prepared foods counter who will check you out. I almost always go there once I turn the corner and see the mess and chaos of the check-out area at the front.