Unless the door is a slider (which I doubt), you shouldn't lubricate the track, as that will only cause accumulation of dirt. What should be lubricated, however, are the rollers which support the door on the lower track. More than likely, these rollers have worn out over the years. Also, the track can become worn to the point of difficulty of operation. Sometimes worn rollers can be replaced. My father has a similar patio door which had a worn track. I installed a 'retread' over the old surface which was sold just for this type of repair. It is a 6' length of formed steel which slips like a cap over the old track and is tapped into position with a hammer and block of wood. I cannot recall the name of the firm that I ordered it from. They carry a large selection of window and door repair parts and accessories. Perhaps someone else reading this can think of the name. Also a Google search of 'patio door hardware' will find it.
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