I have been in the motorcycle industry 1988-2000 and the auto industry since 2000 to current, a break for about 10 years in there. I am fairly mechanically knowledgeable. On 8/1/2 was showing a customer a BMW 330I that we had in inventory. The customer sat in the driver's seat, started the engine and popped the primary hood latch. I was at the front on the vehicle. Since I deal with every make, model and years finding the secondary latch release can be challenging. Initially, I felt under the hood at the center, not finding it I proceeded to feel my way down both sides of the hood. Still not finding the release I inserted my right hand into the grill at first grill opening center right (drivers side). I was feeling inside to find the elusive release. About 1-2 seconds of feeling around I felt the a pressure against my hand. There isn't much space in the grill openings and very quickly I could not remove my hand in time, it was pinched between the vertical grill vent and, at that point unknown, active grill venting. My hand was stuck and the active grill venting continued to close since it indicated the cycle was not complete. I was stuck and it was very painful. My right was stuck in the first opening and I tried to overpower the electric motor with my left hand on the second grill opening (drivers side) I could not overpower it. I slowed it but it continued trying to close. I told the customer that I was stuck and in pain and that I needed help. I could not pull h