Why is the door locked and how do i get in?

Because he doesn't want you to go into that room. You have to lock pick it without him seeing you.

but what about outside with the two guards do you have to pick that to?

If its night out then that's the reason, just wait until the afternoon

well see its weird i go to my pip boy and press wait until morning but it still says the doors locked.

I don't think he opens until noon or the afternoon?

alright ill have to check thanks