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My name is Ican & I am happy to assist you.
On the model kuds03ctbl3,
Try this prosedure, go to the breaker or fuse box
and turn the power to the dish washer off for five minutes.
This will reset the system if there is an electronic glitch in your system.
If this does not open the lock and or trigger the sensor to allow the opening the lock mechanism, this we know there is a fault some where in the latch mechanism.
Then this means replacing you need to have the latch system replaced.
The only other thing it may be is the control board faulting. But this can be determined by a hands on tech doing a diagnostic check to isolate the part s defects.
Let me know how it goes!
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