Expressing About The Express Lane

(I am working as a cashier in a lane that is clearly marked for customers with 20 items or fewer. A customer comes to my lane with a cart teeming with items. I begin ringing her up. About halfway through the transaction, she looks at me.)

Customer: “There just isn’t enough room to put all of my items on this counter! Why isn’t there more space for me to put my items?”

(I could not even form a sentence to respond. After her receipt printed, I checked the item count on her receipt – 110 items!)