Sounds like the latch is stuck or binding on you. IF you tug on the door handles (inside or outside) and feel little resistance, the control arm probably fell off as well.
Only way to get to this is to pull the interior door panel off to get to the lock assembly. The problem with that - since the door is closed, you cannot remove the panel. Couple ways to approach this - keep messing with the door lock and hopefully it will unlock, so that you can get the door panel off and fix it. If the control rod is still attached - could try to slim-jim the door, but since you mentioned that the manual lock doesn't work - this is unlikely to help. Final option is to cut the metal by the door - gain access from the outside of the door. A locksmith can just drill a couple of holes to get to the lock, a DIYer would take a little doing to get to it.