I own a 92 4 dr Ford Focus and the front passenger door will not open from the inside or the outside. When you try to unlock the doors all of the doors unlock but that one. I have tried to manually unlock the door but it wont budge. I have tried to take the panel of the door of but due to the construction of the vehicle it is impossible with out the door being open. Any suggestions would be great. I have tried lubricating all accessible parts.