I had the same issue on my old Tundra. There are two springs on the latch, one big one, and a small one. I'd spray the works with some WD40, and then get the screwdriver out, and see if you can get the small spring to move again. If it is broken/missing, you'll need to get a new spring (should be about $10 I think).
I'll do some googling, but I know exactly what you are talking about. Also, make sure to push the hood release lever back down, because sometimes the spring isn't strong enough to do that.
Let me google, and I'll see if I can find some pictures/better instructions.