When you press the lock button it something works? You may have an issue with the lock button itself. Try the lock switch on the passenger side when it doesn't work. If it works you most likely have an issue with the driver side lock switch (it could be wiring so try this first).
As for the left rear door does the knob pop up when unlocking the doors?
Try these tests and get back to me, Ty
Monday, September 9th, 2013 AT 9:04 PM