Tvoe, you need to use the explosive barrels to clear the path on the 2nd level so the stickman can get to the elevator on the far left. The forklift is your friend.
Use the exploding barrels & the lever beneath the conveyor belt to launch them to the 2nd level, exploding the crates in your way. There should be 2 boxes stacked on the bottom floor when you're done. That's where your friend, the forklift, comes in handy. Have the stickman climb aboard. The button to raise the forklift is hard to find. It's between the steering wheel & the guy driving. Good luck!