The second bag got stuck too.
So she tried to buy it a third time. Finally, all three bags fell to the bottom. But since they were stacked on top of each other, they were blocking the door and she couldn't reach in to get them.
After calming her down and giving her a box of tissues to wipe away her torrent of tears, I went to vending machine and got them out. Since the vending machine doesn't charge you unless the bag hits the bottom, she only had to pay for one and got three. She gave the other two to me.
Needless to say, I happily accepted the payment for my services.