Sounds to me like you broke something inside. I have not had the doors apart on the G6 yet. But older GM cars I've owned had a bunch of metal bars that were connected to the handle and the locking mechanism. I broke the end off one and had to fix it. I used a few zip ties and some duct tape, but that was on a car I didn't really care that much about... and I had no money.
Well, at least its summer. Get used to sticking your hand out the window to open the door. Make it a trademark move for you... Or take the door apart and fix the inside handle. Whatever floats your boat.
You might be better off taking this to a local garage or a dealer.
Aftermarket Exhaust system w/chrome tip. (came with car)
Red ZZ Performance Strut Tower Bar.
Pioneer DEH-P5200HD CD Receiver (HD Radio).
Metra 99-3303 adapter and Steering wheel control adapter.
LED bulbs in climate control panel.
Moda MD9 wheels, Falken Ziex ZE 912 tires.