Lever locks have been around for hundreds of years and can provide significant levels of security for residence, business, and for high security applications, especially for safes and vaults.
John Falle, one of the global experts in covert entry tool design and development for government agencies, figured out a way to impression level locks in a few seconds by drilling holes in the shaft of a blank key, then inserting small pins and nylon fish line into each hole that corresponds to the position of each level within a target lock. The steel pins, all at one height at the beginning of the process, will be moved to the correct shear line position for the bolt to clear by rocking the key back and forth. Each lever actually forces the corresponding pin to the correct position.
Watch the video that Marc Tobias shot while in Lithuania in 2011 at a security conference.