|Theres a small steel wire that attaches the door handle to the lock mechanism, some times they break and need to be replaced. Do you feel any resistance when pullin on the door handle from the outside? if no and the lock pin is up (unlocked) that could be your problem.
As for the child safety lock being on, youi really shot your self in the foot there. You can get the door card off, you'll just have to break every clip and possibly the panel in the proccess. I had to do that on an acura once, not fun.
I can't recall but possibly carefully breaking apart your door handle and drilling out the metal backing plate might give you access to the lever that will release the door.