Usually the latch assembly for a doorknob (the part that sits inside the door and that the doorknob moves to open the door) has a way to go into different doors where the doorknob is in a couple of different distances from the edge of the door. That's what the square hole inside the hole in the door looks like, so that should be able to open the door in the same way as a door knob.. maybe if you get a screwdriver in there and turn that the same direction you'd turn the doorknob and turn the post that the doorknob turns as well you'll get enough leverage to turn it?
If you push the doorknob out on the other side, you'll just have to use a screw driver to turn the mechanism, so there's not much drawback if that happens.
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