LisaRose I'd park the shopping and go elsewhere if after a few minutes the store had made no attempts to resolve the problem. It would probably take up more of my time but if the supermarket isn't prepared to open up another isle then I'm not prepared to give them my money.
Sometimes that last minute on the treadmill, after setting a goal, can seem like eternity. Sometimes that microwave minute can be way too quick if you choose to do something in the meantime, like washing a few dishes.
You're posting a lot lately Simon, have you found a few extra minutes in your day?