My lens wont close

Romrt offers a good start to your problem. Make sure you have fresh batteries. Typically, however,t he lens won't move because it has become obstructed by a foreign object such as sand or other particles. If this is the case, you should take it in for repair. What is the model? Did you buy it new?

It sounds like you did not buy it new so it may not be under warranty. Sometimes you can unstick a locked zoom lens by applying gentle pressure. If your camera lens opens and closes automatically when turned on, apply pressure (very lightly) while turning it off to see if you can unstick it.