It depends on the model of lock that you have. On mine, there is a bar that prevents a Jimmy from accessing the lock rod from above. The rod was vulnerable from below by shoving a screw driver between the sheet metal and the handle frame and rotating to the screw driver against the rod. By attacking from below, to a passerby it looks like someone was using a key to enter the car legally and it only takes second to open. If you know someone with a body shop, they can varify these facts.
Chicago was my home town and most of my antitheft techniques I learned there.
As far as using high voltage to discourage entrance, I used to hookup old color TV tubes, the ones without a voltage drain, to door knobs. I suspected someone was going through my apartment when I was going to class. Shortly thereafter I found one of the building custodians unconsious outside my door upon returning from my night job at Motorla on Polaski St. It was apparent that he had visited other apartments that evening. I removed the wire from the knob, turned on the TV, and called the Chicago Fire Department*. When they revived him, he had no memory of what happen and could not explain the burns on his hand. 30 to 35KV of DC makes an impression.
*Where and when I grew up in Chicago, no one in my neighborhood trusted the police. If there ever was a problem, we called the fire department. They came no matter what and when they left, you still had all your posessions and none of them hit on the female members of your family.
A number of us engineering students equipped our brief cases with high voltage rectifiers and a small battery. When anyone tried to steal the case, they got 10KV DC through the fingers. We never lost one of our high dollar slide rules.
I transferred out of Chicago after the riots in 1970. Working for Illinois Bell as an engineer and living on Michigan Avenue not far from City Hall, I was placed on His Honors communications squad. After that memberable experience, I transferred as far west as I could. Chicago is a beautiful city but between the politicians and criminals, is there a difference?, I know how the system really works.