1. The lid could stay jammed even when water has been properly pumped out if there is a faulty pressure switch or a blockage in the pressure system, as it could be trapping the air that's operating the lid lock.
2. On some washing machines if the pressure switch doesn’t reset, it keeps the lid lock energized. Turning off the machine at the mains should allow the lid lock to cool down and open after a few minutes.
3. Interlocks can take some time to release at the end of the cycle, so be patient. The most common cause is water left in washing machine. Try running a spin/drain cycle. If this fails, the washing machine can be drained by placing the drain hose lower than the drum (into a bucket or tray).
4. The lid interlock has simply jammed. Call an engineer
5. The lid catch, handle, or some part of the lid catch mechanism is broken and not opening the lid.
How to open the jammed lid
Never ever use force!
Call a repair man to fix your washing machine and help you rescue the captured clothes, hopefully as quickly as possible. Then wash again with Ariel to get your great results back.