If this doesn't help you will need to replace the ignition lock tumbler because it has fallen apart internally. Here is how the job is done in the images below. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.