Won't fit with my front rack.

Probable can't lock it with my back rack.

Certainly can't lock it with my kids seat.

I called a store manager out once when I could not lock my bike at the store with woefully inadequate racks. I was tired and cranky and needed stuff for dinner, so he got an earful. Showed him the problem, told him I will not be returning until it was fixed. I never did go back anyway. Easier to shop a bit further away with racks I knew worked.