If I'm understanding correctly - you cannot manually unlock either door from the outside because of no key. Also, the passenger door has lock mechanism issues. I would suggest removing the interior door panel on the passenger side to see what is going on (including rusted parts). Then you could also have the locksmith make a new key using the passenger side lock. If you can't even open the passenger door there should be a small opening at the edge of the door on the inside where you can use a screwdriver to manipulate the locking/latching device (play with it).