light switch will not move
If you are here on Stack Exchange asking if there is a way to fix a light switch, then I would guess you're handy enough to replace it. It truly is simple and should only require a screwdriver. Turn off the breaker, 2-screws on the cover, 2-screws on the switch, 1-screw for each wire (probably). Take a photo of it with your phone before disconnecting the wires so you'll remember where they go. You can purchase a standard switch at any hardware store (or even Walmart!) for pocket change.

If you come up with anything other than what is described here when you take it apart, post a photo and we'll help.