Panasonic inverter microwave DISPLAY SAYS LOCK.HOW DO I UNLOCK.MANUAL LOST

You might have set the child's safety lock by accident by pressing the START button three times in a row. To unlock the child's safety lock, press the STOP/RESET three times in a row. Hope this helps.

Your owner's manual will tell you the key combination for your specific model.

If for some reason you don't still have yours, you can probably find it at the Panasonic support site here: http://service.us.panasonic.com/OperMan/

If yours is a non-US model, look in the support links here: http://panasonic.net/

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