There's a child safe feature on most car back doors that only allow them to open from outside. It's a switch in the door jam and if it gets left in the middle door won't work in or out! Nice safety feature!!

That may NOT be the issue but know it exists. Can't really believe both did the same?? A body shop may be your best bet if all attempts fail to get them open with minimal or no damage. Keep trying both in and out handles and hopefully you'll get them open. Last one worked for me after many tries and it was the stupid switch! Good luck,
_________________________________________
Tom Greenleaf - MetroWest, Boston
http://acsource.net/acforum/index.php