2002 Kia Spectra

I have a 2002 Kia Spectra 4dr. Sedan, on which the front
passenger door lock is stuck, The key won't turn and the
inside lock can't be unlocked. The door is closed, so the
door panel screws on the outside edges are hidden by the surrounding door frame. I removed the upholstered
part of the door panel, to try to access the mechanism,
but there is no access hole in the panel. The only hole is
where the door opening lever is, which is about 2x2 in.
I've squirted some lubricant into the hole toward the
mechanism, and also in the key slot on the outside of the door, but nothing works. I'm trying to avoid having to go
to the dealer. Hope you can help me!