I have a 2007 ford focus and the back door on the passanger side wont lock manually or electricly.i try to push the lock in but its like its stuck, and when i try to use the electric switch its like its not making contact. this has happend once before but one day it started working again. i want to know if its an electrical problem or if by some chance it just got jammed both times.

First try some WD40 sprayed into the inner door this may loosen things up, ask you said the door locks sometimes worked.
if not sounds like the linkage in the door has either bent, come off, or water got in and rusted things up, in any case you will have to take the inner door panel off using a tool you can pick up at the auto parts store.
In the door ( beside the window mechanism ) you will find heave metal rods/linkage for opening /closeing the door latch and lock.
you will have to see that all are connected and not just hanging.
you will also find a connected to this linkage a small round or rectanular item with a couple of wires this is your electric door lock. you will have to manually check to see all are moving freely and if not fix it. or just take the car to a mechanic or body shop.
good luck