My driver door has an issue. The door cannot be opened using the inside handle. To exit the car, I have to let down the window and use the outside handle. What would cause the latch to work from the outside but not the inside? My mechanic thinks I need a new driver door latch but finding one that works with the keyless entry keypad (part number F5DZ5421813E) has proven to be difficult. Anybody have thoughts on this?