Make sure you're spraying the lubricant on the plastic bits...not the ignition switch (metal area your key goes in). it's not a good thing that you can start the car with a screw driver now. Even if the ignition switch works correctly (postion I, II, & ignition), it may not in the long run. When the ignition switch stops functioning correctly, this tends to lead to a randomly dying car (from the electronics) as well as other strange electrical issues. Anyway, if these things happen, you'll know where it came from. The shift-lock over-ride button should pop up. Try spraying it too. This may be why your key was stuck to begin with.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.