Which method has not been commonly used to crack safes in recent years?

The method that has not been commonly used to crack safes in recent years is utilizing a laser beam. This technique is less practical for safecracking compared to the more traditional methods outlined in the other options.

Laser beams require sophisticated equipment and often specialized knowledge to be effective, making them less accessible for unauthorized users compared to more conventional methods. On the other hand, punching, core drilling, and even using a fluoroscope are more straightforward and have been utilized in practice, highlighting their practicality and effectiveness in safecracking scenarios. Thus, the use of a laser beam stands out as an unconventional approach that has not gained traction in recent safecracking attempts.