Lock Up the Accused

It can sound a bit funny to hear that the cops have lost the key to the lockup room. They have caught a most wanted criminal of the city and they must put him behind the bars but they just cannot find the key. You happen to reach the police station by sheer coincidence and you come to know about the problem that the cops are facing. You want to prove that you are a good citizen and you will do all you can to help the law enforcers of the city. You seek the permission of the cops and start your search for the lost key. Thinking and acting smartly will be a better choice than randomly looking around for the key.