Okay, I’ve completed the steps, as far as I’m aware. However, what exactly is going on here…? I could do with it being explained so I have a better understanding what the code is doing. 
Also, nothing happens. I pick up the key, I go to the door and press the interact key, but the door doesn’t open. I’ve also set the Line Trace By Channel to draw the debug for the duration, but I don’t see anything.