If that's the kind I used to have to deal with that locks unless there's a certain amount of weight on the seat (I assume to keep kids from messing with them, because they're so much more damaging than 400 pounds of stank /s) , just lift if by the basket to get the front wheel of the ground and then pull it back into the store. I refuse to sit in those unless I'm injured, and I'll be sure to bring a thick throwaway blanket to sit on.