Key stuck, trunk locked, no power, won't charge
 

My son's 2013 RS was dead this morning after about a week in the garage. The key won't come out of ignition, I suspect because there's absolutely no power, not even a weak light anywhere. Tried charging all day, but still nothing. Can't open trunk to change battery, can't reach engine with a jumper cable. Now what? Convertible. 13k miles. Auto.

Fold down the rear seat, and have a skinny person reach back and pull on that white release handle that's on the trunk lid. Convertibles have a key release that's hidden by the rear drivers side seat backrest bolster, not sure if coupes have the same.

Camaro 69. The convertible back seat doesn't fold down. There is a keyhole inside, but the key is stuck in the ignition. We unhooked battery lead and are trying to charge it that way. Hopefully it will get enough charge to at least get key out. Thanks.

Pulled my truck battery out and hauled it up to use as a jump. Not enough juice to start it but I did get key out and opened trunk. Brand new battery. I guess it did this at dealer and they thought they fixed it. Still won't charge. No clue what to do next. Any ideas?