It's covered in the walkthrough.
The walkthrough goes over all the steps that need to be taken in order to get the guy into that room so you can pull the wedge out.
Have you clicked everywhere in the room -- the stairs, for example, which you'll need to access. That's important. The game needs to know that you've registered why
you want to get the guy out of the way.
Where is the guy now -- still watching TV? You have to get him out of the way, so distract him by messing with the satellite so he has to go into the smaller room to fix it. The walkthrough tells you what to do here.
Then when you see that the room is empty, you can move the wedge.