Forum:Help stuck in Vault 22.

I have gone into vault 22 for the second time. For HEPA filter. i saved Kelly(or whatever) got the filter and went to leave but door to outside is locked and needs a key. Any ideas where key is or if its a glitch? i've searched everywhere can't find key..... Thanks for any feedback.

u have to talk to kelly on your way out, she will let you out