my vauxhall zafira is not recognising keys have been removed?

I have a 2006 Vauxhall zafira, I can no longer lock my car because after parking I turned the engine off and removed the keys but the radio stayed on and then when I opened the door the warning light and sound came on to tell me the keys were still in the ignition which they weren't and because of this I was unable to lock the car, even when I try to lock the car manually only the drivers side locks and not the rest of the doors. Any solutions??

Sarah Magee
December 2011