You need to remove the door s inner trim panel and then the outer door handle in order to then disconnect the lock assembly.
2002 ford focus door panel removal.
The window regulators are riveted but lock dosnt appear to be.
Any questions or if you need help on the front door panel removal comment and ill gladly make another video.
Removing a door latch from a ford focus car is not an easy task.
According to the haynes manual there are just 9 bolts securing the inner panel amd 4 bolts securing the lock.
The panels have to removed if you re installing extra accessories such as a keyless entry or alarm system or to place sound deadening material against the doors.
That looks like the inner panel from the mk2 rear door.
Https amzn to 2lpmzxn with this camera i recorded this video.
The latch is part of the complete lock assembly which you must remove.