I've seen too many people making a big deal on removing the board barricades from doors. All you have to do is crouch and walk into the door. Then, while still moving forwards, aim at the bottom of the board (provided it's in the middle of the door) and right click. It's that easy. Please do NOT post replys like "I already knew this." or "No ~~~~~." because if you already know it then this post is obviously not directed toward you. Thank you.