Escape From The Stafford London

This Luxury Hotel is located in London. My office meeting is conducted at this hotel. So all the members are assembled here and finished the meeting successfully. After the meeting is over, everybody left. Now I am alone here and the exit door is locked unfortunately by mistake. I do not know how to unlock this exit door as it is a very challenging task. So can you please find the related objects and solve the puzzles to open the exit door and Escape From The Stafford London soon