Reverse Bear Trap (Saw) for People Playground

been trying to make this for weeks, only came up with the completed version
This is the Reverse Bear Trap, from SAW I.

To start the game, you must read the "PLAY ME" audio tape, located near the dead body within the room. Once you have fully read it, the timer in the back will go off.
You must free the human from the restriants on the chair to get free.

Then, you must dig in the dead body found in the room to retrieve a key (via using a knife), unlocking the trap and winning the game.

You must put the key directly under the big and obvious gear located on the trap