What should I do if the oven door remains locked and won't open after cooling?
Turn the oven off at the circuit breaker and wait a few seconds, then turn the breaker back on — the oven should reset itself and become operable. If the door does not lock properly before self-clean, turn the mode knob to OFF and call for service at 800-944-2904. (Page 19)
From the official Bosch 5000 Series Wall Ovens manual, page 19
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