It sounds like the door latch is broken and needs to be replaced check out the diagrams below to show you how to change it out.
Also if the door is not aligning with the striker, then the door hinge bushings are worn out causing the door to sag.
If the door is aligning with the striker, then perhaps the striker needs to be adjusted, in or out or even up and down. But if down, most likely that is the result of what I said before and the door sagging because of worn hinge bushings.
The striker on the other hand may have a torx head and if it does, since they are usually very tight, I use the proper torx bit and an impact to loosen it up.
Then tighten by hand just enough that it will still move, but hard to move and close the door so it moves the striker to where it has to be, the slowly open the door, trying not to move the striker, then tighten the striker with the impact, and try it a few times to make sure it is okay.
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Tuesday, January 2nd, 2018 AT 5:56 AM