Escape Restaurant

This is a newly opened restaurant and it has already grabbed the attention of many customers. Unfortunately today it has been an off day for the restaurant business as only one customer came today. The keeper of the restaurant did not know about this customer and so he locked the exit door and left. The customer approaches you to guide her out of restaurant so that she can go back home. You being a new employee in the restaurant do not know much about the place but it is still your duty to help the customer. Look around in search of the spare key that can be used to unlock the exit and let the customer out.