Thank you all for post, but the Master Key idea will not work - I've tried it. The next option, according to Lexus, is to drill out the trunk lock by a body shop. Or, go in through the back seat and drill a hole in the metal wall, try to access the bar that is "stuck" in the lock position, and see if that doesn't work.
I have called several Lexus dealers now, and they've made these recommendations. I was just hoping that someone had actually done it, and, if so, could say which method they used.