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Hi my name is Robert.....
I want to say I dealt with this once before try resetting the parking brake and hold down the foot pedal and see if the key will turn. Also make sure the unit is fully in park, sometimes on the shifter if it is not all the way up in park position the key may not want to turn. Beyond that you might need a mobile service to come have a look.... Robert
Also wanted to mention you do want to verify your chassis battery voltage, if the voltage was low then the key also might not want to turn for you. Normally under 10 volts you can have problems.