What should I do if my washing machine door will not open after a cycle?
Press Start/Pause to stop the washing machine and wait, as the door will not open until 3 minutes after the machine has stopped or the power is turned off. Make sure all the water in the drum has drained, as the door may not open if water remains. Check that the door lock light is off, which indicates the machine has drained and the door can be opened. (Page 54)
From the official Samsung WW90CGC0EDAB Front Load Washing Machine manual, page 54
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