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Is the battery dead? Do the headlights look normal brightness?
Just be clear, the key will not turn in the switch to release the wheel?
Do you have any graphite or some kind of lube you can use on the key? Sometimes the lock cylinder can get dry and stick. Also be agressive with working the wheel back in forth in case it is in a bind.
If this does not work you will need a mobile locksmith to determine the problem, it could be that the lock cylinder has failed.