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There is a thermal breaker strip in the lock motor that looses contact over time resulting in lazy or no operation similar to what you're experiencing. There used to be reports of peeps stuffing tinfoil into the cavity to circumvent the problem. Its been awhile since I saw any reports of anyone trying this method, at the time I thought it was kind of a half-a$$ deal. I had one lazy lock when I got my truck in 2013, I replaced it with a Ford-store part, about $30 at the time. They have all continued to work since.

You have to pull the latch assembly to replace the lock motor. While the latch is out, check the door ajar switch for sticking which is another common problem, and can only be addressed while the latch is out. Kill both gremlins at the same time.
 
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