https://imgur.com/gallery/5CJKdku

Take it a part and see what holding it up.

As stated you will have to take it apart. Actually I just did the same thing with my similar lock. I cleaned it with WD-40, then alcohol to remove the WD-40 (because it will stick when cold) and lubed it with graphite dry lube.

You will have to remove the bolt and clean that as well.

I think this is pretty simple, not a lot of intricate parts to deal with.

I just replaced old knobs and I tightened the screws on one too tight which made the handle tough to turn. See if loosening the screws helps

https://imgur.com/gallery/fKDTCie Update on internals

Hi I just took it apart, I don't know what to look for, just wipe everything clean & regrease?

I’d just replace it - but generally if you can wd40/oil it and then just work the mechanism back and forth until it’s looser and then refit into the door.

Now that it's taken apart, does the knob and spindle rotate without issues? If yes, then the latch is your problem. Next, see if the latch moves freely. If it doesn't, clean and re-lube. If both parts work good while taken apart, then the assembly on the door was the problem, i.e. mounted too tight/at an angle etc.

Spindle rotates good, the bolt is able to spring back after pushing in, don't see anything moving behind the mounting plate.

The bolt doesn't push in all the way either

Your submission has been removed for one or more of the following reason(s):

• You are asking about a project that someone else did, or you're considering having someone else do.
• You are not asking a question relating to something DIY.
• You are not asking a question at all.
• You are submitting a "DIY Tips" or "Tricks" post.
• You are trying to submit a survey / fundraiser.
• You are asking what an item is called - try /r/whatisthisthing.
• /r/DIY allows only two types of posts - finished projects & help requests.
• If your submission is neither of these - it will be removed.

Please read our Full Sub Rules before resubmitting.

If you believe this was a mistake, please message the moderators.

###Do not respond to this comment - you will not receive a response.

I didn't look for anything. I sprayed the whole mechanism with WD-40 moved the parts by hand many times. Make sure the mechanism operates freely. Wiped off most of the WD-40 with a paper towel. Lubricated with graphite and reinstalled.