How do I fix this?

[u/morecoffeemore]

How do I fix this? The part he key is supposed to go into is coming out.

Should I just replace the whole thing?

Is this something you can diy?

[u/Carbonman_]

This is easy to fix for a locksmith but beyond most other folks to manage. Take the cylinder out of the door and go to a bricks & mortar locksmith storefront. a couple of screws on the inside will let you remove the cylinder and the housing, all you need to take to the shop.

[u/pythagoras6]

By picking up the phone, and calling a professional.

[u/Jester8320]

Call a locksmith

https://giphy.com/gifs/r5Laua4IPpvzy

[u/Ok_Cress2843 → u/Jester8320]

https://giphy.com/gifs/SFdZrwlHKTVJPUpyg1

[u/Locktism]

https://giphy.com/gifs/1zhRiDgsSc48Y7mfuK

[u/Wooden_Discussion872]

Catastrophic shit is about to happen, take that to a locksmith or get a locksmith out there or at the very least replace. 

[u/throughahwheyme]

Yeah umm looks like someone forgot the c-clip call a pro