Set up a system to call a "Code 3" or something similar when more than 3 people are waiting in line at the registers. I visit your stores daily and most of them are pretty good. However, some don't seem to care how long the wait is. At times, I have seen 2 people cleaning around the coffee pots while chatting and laughing, 2 or more making food, and 1 person running a register with 10-12 people waiting in line!
Re-think the store layouts so that when you enter a store you don't walk though lines of people waiting to pay. The MTO section should be along an end of the store, where you pay right there, and you wait out of the way of everyone else.