If you have no clue how to get to the door in the first place I will show you here, if you already know you can just go to the next part.

After breaking the door in the elevator room, you can see a toilet door on the right, jump on the ledge its on and break it.

After falling through the door you will have to break two windows to get in to the break room.

There's only one door in the break room, so just break it without going through yet.

Now that you have made it to where you need to be you just have to follow the three jumps and you will be done.

First you need to jump on the ledge shown below, just hold w and you should be fine.



After that you will see two tables on the other side of the hallway. You can't reach the higher one so jump on the part of the lower table shown below( If you need more space, you can also destroy the upper one, but becareful not walk backwards too much, because then you can fall on top of the chair which will make the last jump impossible impossible) :


Now you are basically ready to get to the door, just adjust your crosshair like I do (doesen't need to be too precise) and hold w. You should be able to easily get to the door and you don't even have to break the door mid-air because you can stand on the doorway just fine.