lost ignition key?

hi i lost the ignition key its a standard vauxhal astra n reg i took apart the barral to start it with a screwdriver but its turnin over not startin doesnt sound like its firein has this car got a extra device that ive overlooked to stop it startin after takin apart the barrel ps engine management light is flashin and it ia a automatic i am startin it n and p its just not workin