As a matter of interest, roughly how many permutations of key are there for a modern car?
At least modern cars don't print the code number on the front face of the lock barrel, as happened with ignition locks such as on the Mini. Apparently one enterprising thief smashed the window of each car he was planning to steal, read the number, dashed down to a car spares shop to buy a key and was back to steal the car within an hour or so.