Drivers side door wont seal,

Your door ajar system is tied into the door latch mechanism. if the door still appears to close tightly, and the door latch works properly, then you may need to adjust or replace the latch, though ford has listed a cleaning procedure for the latch that involves using a tool to test latch position and manually closing the latch (while door is OPEN) using a screwdriver 10-20x and monitoring to see if the latch consistently shows CLOSED and OPEN when it should.
If pushing the door closed after its already closed causes the lamp to turn off, an adjustment of the latch may help, or cleaning the latch contacts may also help. If the door never shows latched regardless of how hard it is pushed, it may be a defective latch, or a wiring problem (Door wires sometimes break in the door harness between the door and the side of the dashboard when the harness enters the vehicle).

pay someone to fits it

handles may be in good condition but the lever on the latch itself may have came loose. your mostlikley looking at dismantelling the apolsery with the door closed to rectify it.

It appears that the door is not closing far enough for the latch to move to the second position in it's movement. ie on not closing the door properly you will see that it is latched but not closed . Push it harder and it closes properly. Lubricate the latch mechanism and you may have to adjust the catch position to allow the lock to go to the fully locked position POssible rubbers to cold and stiff to allow the door to close easily

the arms have fallen on the lock latch inside the door. you have pull off door panel to fix it

On the passenger door,make sure the latch isn't in the closed position(have someone pull on the handle while pulling the latch mechanism with a screwdriver)The drivers side is gonna be interesting.You might be able to get at the door latch mechanism by rolling the window all the way down,and use a coathanger or similar tool to operate the linkage levers that way.

Inspect the inside door handle closely. Those are notorious for breaking. They start by cracking and then it doesn't pull on the rods that go to the latching mechanism hard enough to open the door. Did you notice that it started getting to where you had to keep pulling on the handle harder and harder to get the door to open? If so I would almost bet that you need a new inside door handle. They are pretty easy to replace but you will need to remove the door panel. The latch mechanism may be messed up or maybe just needs some lubrication.

the door lock mechanism has a broken spring internally .door lock has to be replaced.

These things can be a pain, cause I have one... Have you adjusted the striker mechanism? Your adjustments are basically the striker and the door hinges. It is possible that you have worn door hinge pin(s). You may need to adjust the hinges. Rick

pull the outside handle and unlatch the latching assembly by hand by insertins a screwdriver where the striker would normally be if the door were closed - and pry out.

You can adjust the striker by loosening the bolts, and moving it in toward the cabin.

If the door itself is droopy, adjustments are made by the hinge by loosening the bolts and lifting up or down.

Multiple attempts will be necessary to get it just right.

Dont get frustrated if it doesnt fit properly in the 1st or second attempt.
Good Luck!!