How do I get part of a doorknob out of my locked bedroom door?

My 4 year old son (yes, he's too smart for his own good) locked my bedroom door, and tried to "fix it" by using his daddy's screwdriver and taking the doorknob off. The problem is the locking mechanism is still stuck in the door. How do I get it out without breaking the door down?

Answers:
in the center of the the doorknob is the locking cylinder, or tumbler, using a small thin screwdriver, put it in the cylinder and turn it left, it should unlock it, then you should be able to slide the pin out of the door jamb, good luck

Other answers:
put the screwdriver into the center hole of the locking part thats stuck in the door and turn it....it might be hard but you can't hurt anything
put the screwdriver into the center hole of the locking part thats stuck in the door and turn it....it might be hard but you can't hurt anything
Can you put the handle back on? If not, you should easily open the door, without the hndle, by pulling back on the latch portion of the latch. This is what u see with handle removed.
Hard to explain, not knowing exactly what is there in door and what is not.
Try the site below, it may help
The knobs turn a center opening that pulls the strike away from the door frame.

Stick a screwdriver into thje center of the locking deal, and turn it side to side forcefully.

Once the door opens, remove the lockworks by taking the screws out of the side of the door and sliding the lockworks out.
stick a thin screw driver in the hole in the center of the knob and push the lock should pop open or yu may have the type that has a slot in side the hole which will need to be turned with a straingt slot screw driver
Try plastic explosive, works every time. There are some obvious draw backs to the advice I have given.
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