Formal Living Room Escape

A chemistry professor resides in a formal flat. He conducts classes in his flat occasionally.
He is strict in his teaching and punishes them severely.

One of his students, who hate the professor, locked him inside this formal room and thrown away the key. Now he has trapped inside this room.

To open the door needs the duplicate key. But he the place, where he kept that key

Today there is an important press-meet; he has to go without fail.

Help him find the duplicate key. Your task is to gather the items, combine them logically to have a GREAT ESCAPE!!!!