Door locking conundrum

[beaterku]

Good morning all,

I have a perplexing problem with my door latches. I am thinking that they are just worn out but I thought I'd ask the question here to see if there was something I am missing.

The problem I am having is the doors will not lock when the are closed. They will lock when open, but not when closed. The latches appear to be original and are a little loosey goosey. I've to the glass out of the doors right now to replace the wing windows so I thought there is no time like to present to fix this issue.

Any ideas?

If they are indeed old and busted, where is the best place to find new latches that are complete junk? I am going to replace the keyed locked mechanism as well since it is pretty loose too.

Thank you everyone!

-Nick