I have an Amana ACF4255A and the lock is in the on position, and the oven door won't close.

SOURCE: Oven Door Doesn't Completely Close

no adjustment. probably needs new hinges - hinge spring gone slack

SOURCE: Oven Door Locked

is it locked in the up or down position?

SOURCE: amana oven

Error F-9 means:Door lock safety circuit on ERC sensed Replace the door latch assembly

To solve this...Just press and hold the door latch to unlock position and then press cancel for a few seconds. The latch will return to its original position

This will probably fix it..but if doesnt work try this
Try unplugging the oven from the electrical power. May release the lock, which is held in place by a tiny micro switch. If not and while the electric is still off or the oven is unplugged, use a bright light flashlight to look through the slot where the lock is in the oven, not in the door.

You may be able to use a thin blade screwdriver to move the lock to the release position. Check the angle of the lever. A slightly bent lever handle also can cause this type of condition.

If all else fails, remove the access panel on the front of the oven to access the locking device and release it. May have to disconnect the wires to the lock which will allow door to function but not during any self cleaning modes.

SOURCE: Whirlpool self cleaning oven, Super capacity 465, door will not close

I had the same FSE error which the whirpool web site advises that you will need to schedule a service appt to fix. Instead I leaded against the door while initiating the cleaning cycle and the door locks and oven cleans fine.

SOURCE: Oven locked so I can't shut door/operate oven

Thanks a million, solved the problem like a charm. For those that can't find it, it is on the left side orf the OVEN, not the stove. Once you open the door, you'll find it on the frame's upper left side corner, can't miss it. Good luck