Go back to the main room. Use the controller pad and move the sandbag to the woodworking room: Rise, Up, Right, Up.
Go into the woodworking room. Find the sandbag. Lift the handle on the cutting machine below the sandbag. Grab a gold metal bar.
The following steps will show you how to forge a key to the bottom drawer of iron box.
Locate forge in the main room. Grab the handle and open a compartment. Insert the kindling. Close the compartment. Place flint at the empty slot on top of the wheel. Spin the wheel COUNTERCLOCK-WISE to kindle the forge.
Return to the iron box. Insert and turn key. A slider appears. Slide the disc to the right. Go to the right side of the iron box. Grab a hollowed-out metal block. Slide the disc to the left. Go to the left side of the iron box. Grab a small connector.