Hello, on the Charlie and the Chocolate Factory game on GameCube, in the exploding candy room, how do you open the black-bar like doors?

I think you will get better responses if you asked here:
https://www.askmehelpdesk.com/video-games/
You are in the games area. You may still get answers but Try that one as well.

Go on to a video game website with forums and you should most likely see a post about it.