What Captain Carrot said. You'll get something. But all the goodness is inside.
When this happened to me, I put the grains in two freezer bags on a cutting board. Then I used my cast iron skillet. I rocked the edge back and forth over the grains, cracking them as much as I could. It's the same technique I used when I need to crack peppercorns or coriander seeds.
Relax. You'll screw up worse.