In fact, I really dont want to ask anyone for anything these days.

The problem is usually that the strike plate is not lined up correctly with the door knob.

There are 3 ways to fix this problem that is described in this video.

How To Fix A Door Latch - Home Safety - Carpentry Hacks

Image By: The Honest Carpenter Via YouTube

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These tips are so useful, this is a really great video!

Easy Door Latch Hack - DIY Home Hacks - Easy Door Fix

How To Fix A Door Latch - Home Safety - Carpentry Hacks