general problems of the 1997 Ford Explorer

The contact owns a 1997 Ford Explorer. The driver side door will not open from inside the passenger compartment. The lock sticks and will only open from outside the vehicle. The door lock itself is not working and when the contact pushes the unlock control on the door panel, it fails to unlock the door. She is concerned that she may not be able to open the door in case of an emergency. The purchase date was unknown. The current mileage was 168,299 and failure mileage was 167,299.