One of my guinea pig pups is hiding behind furniture that I can't move, how do I get him out?

So my dad decided it would be smart to put a couple of curious baby guinea pigs near a large piece of furniture and one of them ran behind it and won't come out. I put food at the entrance and put his brother in a cage nearby so he squeaks a lot. (close to the food so he stays motivated and in view of the one behind the couch). He's come out four times but every time we go to seal the gap with a broom (far enough so he doesn't see us) he runs back. Any Ideas?