Chapter 1 - The Apartment | Ada's campaign Resident Evil 6 Guide
Last update: 11 May 2016
First examine the door and then a small hole in the adjacent room.
In order to unlock it, you have to use a button under the goat head.
Now, looking through the hole you will see a changed image with black bird in the middle.
This bird must be placed on the lock next to the door.
In order to do it, turn mechanisms in corners of the room.
When all four are correct, go to the lock and unlock it.