Kitchenaid ovens have an oven door that locks. The lock on a Kitchenaid oven engages when it is operating in the self-clean cycle. This is a safety feature because of the high heat the oven produces when it is self-cleaning. Sometimes the door lock will not disengage, even when the self-clean cycle is finished. This makes it impossible for you to use the oven normally. This problem is fixed fairly quickly and requires no tools.
Wait for 20 minutes to ensure that the self-clean cycle is finished. Sometimes you may think the cycle is complete and it is not.
Start the self-clean cycle by pressing the self-clean button and setting the timer for 2 or 3 minutes. Wait for the cycle to complete or press the "cancel" button. Try to open the door.
Press and hold the button with a picture of a lock . Hold the button for 20 seconds and try the door.
Unplug the electrical cord for the oven or switch off the circuit breaker that supplies electricity to the oven. Let the oven set for 10 minutes without power. Resupply the oven with power. The door lock should be cleared.