A difficult repair problem often faced by service center technicians is opening doors when the latch is defective. You might first try calling or going to a professional locksmith and pay them to use their specialty lockout tools. Failing that, the next step is usually to remove the inner door trim panel to release the latch, not an easy task with the door closed and the seat in the way. It may be possible to remove the seat first for easier access.
Chino Autotech Inc.,
Auto Club of SoCal Approved Auto Repair Facility