Move forward down the hallway until you reach a choice where you can go straight into Elliot Ludwig’s office, right, or left. Go right for now and head down the hallway. You will come to a gap with a pipe over it. Newly added to the game is the ability to grapple and swing. Shoot a hand onto the pipe and swing across the gap to reach the other side.
Continue heading forward down the hallway to reach a room at the end. Turn right in this room to find a door blocked by a number of barrels. Move the barrels out of the way and open the door to access the storage closet. On the far wall in the closet is the key to Elliot Ludwig’s Office. Grab it and head back to the red door we saw earlier.