DIAGNOSIS Yeah, this one's common. The door lock mechanism on these models uses a motor and a latch, and it can stick or fail after a high-heat cycle, especially if there was a lot of debris. The oven is also designed to not unlock until it cools below a certain temperature.
FIX First, ensure the oven is completely cool (like, wait 3-4 hours after the cycle). Unplug the range from the wall outlet. Look for the door lock assembly, usually behind the lower kickplate or inside the broiler compartment. You'll see a small motor with a plastic cam. Manually rotate that cam with your fingers or a tool in the direction that retracts the lock bolt. You should hear/feel a click and the door will release. Plug it back in.
IF THAT DIDN'T WORK If the mechanism is completely seized or the motor is dead, you might need to remove the inner oven door panel to access the latch from the top. This is more involved and you might need to order a new door lock assembly (part number WD21X10022 is common for this series).
HEADS UP Never, ever try to force the door open during or right after a clean cycle. You can damage the lock, the door, or the hinges. Let it cool first, every time.