I think this partly depends on where you're heading with this story. If you're going for comedy, the hero (Clark?
) could try a plethora of every weird method you could come up with
If that's not the point of the story, though, I think your best shot would be showing the hero's frustration for a bit, then have him contemplate what's the hardest/strongest material on the world, possibly trying to cut his nails with a diamond, if there's one available, and then deciding he's the only one who can hurt himself. I think that, after he's realized that, thinking of the heat vision technique would only be a matter of time.
Just a couple of ideas. In any case I think there are several ways to go from here. It's certainly an interesting thought!
Hope I've helped
AnnaBtG.
