Chateau De Malmaison Escape

  Just Imagine that it was a historic palace along with the Tuileries. It was the headquarters of the French government in the 18th century. People are telling that there is some secret hide behind one of the rooms in the place. On that day nobody is there inside the palace. At the time I entered the palace to see the secret behind the room and make sure that nobody is watching me. But unfortunately, the entrance door is locked. I have no clue about how to come out of this place. Help me to Escape from the Chateau De Malmaison palace.