Well, I suppose a snake could get stuck, but it's quite unusual. They are good at wedging themselves into places..as it makes them feel more secure.

I'd leave the snake alone! -you may just stress the poor thing out and cause it to regurge. Let's say it DID get stuck.. most likely because it just ate! After the food digested, the snake would 'unstick', still I think it's unlikely that it is really stuck.