A few days ago, after unlocking my driver's side door (power locks) and
getting out of the car, I pushed the door lock to the locked position, and
moved the door to close it, but the door would not catch and close...it
would bounce off and stay open. My dad fiddled around with the lock inside
the door and instead of fixing the problem, reversed it, so the door
closed...now it just won't open. He said it could be a bad relay, but I
have no clue. Any ideas as to what could be wrong, or suggestions as to
what the best possible thing would be to do in this situation?

 

Might be in the latch assy. If it gets corrosion inside of it, it can lock up like that. If you can get your door back open, try hitting the latch with some rust penetrant to see if you can't get it to free up.

 

If that doesnt work, take off the door panel and see whats going on.

Good luck