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The fault could be caused due to a number of issues.Firstly please turn the unit back on, push the door inwards 2-3 times and then leave it for 5 minutes.
If the lock symbol is still shown, set the washing machine to a spin cycle and then wait 5 minutes.
Should the door lock not disengage after the spin cycle you will need to call out an engineer, the most likely reason is the latch has failed, and it cant release the lock, or a sensor is faulty and the washing machine thinks the washer is still full of water.
Please let me know how you get on, and if you need anything else clarified.
To confirm you have tried pushing in the door to help free the latch mechanism.
Unfortunately there isnt a master override for unlocking a Normende machine, however you could try follow the instructional video here, which shows a way of using some wire to manipulate the catch, however this can damage the catch so please dont use to much force. Alternatively the video here shows you how an engineer would manually open the door, but please make sure the power is switched off.However that said you will need to get someone out to check if its the sensor or door lock which needs replacing, both these parts are relatively cheap, so it would be worthwhile repairing.
Please let me know if you require any further guidance regarding this matter.