Do you have the model number please.
Also does the hob flash up an L?
Ok this isnt down to the child lock as if it was you either get a picture of the key flashing or L on the display depending on the model
If you have the lights fickering and nothing is responding then it sounds like water has got onto the electronics in there.
What you can try is turn the power off to the hob and leave it 24 hours and hopefully it will dry out. Turn it back on and see how it goes from there.
But if after that its still the same then im afraid the control board will need to be replaced to cure this.
Im afraid this isnt a case its of the child lock being turned off on this, Sorry.