According to Fallout Wiki, even though the door says it requires a key, there is no key to open it. The developers put it the door there but didn't intend on people being able to access it, but basically behind the door is the room with the entrance to Vault 87.

I did all that shit only to find out i have 49 in sience

maccready is cooler in fallout 4

why won't joseph tell me anything and only offer me a haircut?

WTF, I cant get through murder pass because I dont get that speech option, and neither do I with Joseph, tried fucking everything. (Lvl 30 and no Child of Heart)

For anyone having trouble getting the right speech options to show up, you have to continue the main quest. When you get the quest "Picking Up the Trail" you will need to go to vault 87. I didn't get any of the speech options I needed despite having child at heart and 100 speech. After I got the quest though to go there, I was able to get in.

Something i want to comment here, there is a special Laser Rifle here.

the fact that you read out loud NPC is saying something is kinda annoying

NO PROB! My follower in this vid is Star Paladin Cross. You can get her in the Citadel lab. You need Neutral karma, I believe. She's alright, I guess. She's deadly up close but not so good at long ranges. I would recommend Charon as he is easy to get and is very deadly at both close and longer ranges. You can find him in the Ninth Circle (a bar inside Underworld located in the Museum of Natural History)

I'm pretty sure you have to talk with the mayor if you still have this problem, but it has been 11 months since you said that so you probably fixed it or used this method. If you keep talking to the mayor, he will eventually lead you to the door and open it for you.

why are you saying what the NPCs are saying lol its screwing me up

For some reason, I can't use murder pass despite doing everything. When I try using the pulleys, it says "You cannot use this at this time"

thanks for the help i was walking through a lot of radiation trying to find this vault

ok so how do i get in without using the terminal cuz i must have fucked up i cant ask him about it

Lil bro really be saving the next 20 generations