Some early vehicles had very little in the way of security.
When I was at UNE in the late 60s, a friend of mine had an FJ Holden which he believed was the best car ever built. In fact I'm pretty sure he believed that it was the best car that was ever likely to be built.
One day he claimed that no-one could start the engine without the key. Since I knew better and knew that his car wasn't locked, I bet him that I could.
As I ran outside to the car park, I took out the scrap of foil from my pocket from the chocolate I had recently eaten.
Within seconds of getting in the car, I held the piece of foil in what I knew was the right spot behind the ignition lock and started the engine.
I have never seem anyone so astonished.
If I remember correctly, the procedure for starting a Mini was to pull out one fuse and place it alongside the adjacent fuse.
So in neither case did you need much in the way of knowledge or specialised tools.

