Covertentry experts have employed this technique quite successfully in many venues around the world, and the exploit is fairly well known in our community.
In my earlier post, I rather sarcastically questioned whether Kaba engineers, in the 1960s, were aware of the concept of magnetism as it applies to covertentry.
As an example, last year at the Dubai Police Headquarters we taught forty criminal investigative agents about lock forensics and covertentry in an intensive hands-on setting.
Current high security cylinder locks that protect government and high value commercial facilities are rated to be immune from attack for a minimum of up to fifteen minutes against covert methods of entry.
The California DOJ standards are the benchmark for gun safety for other states in the U.S. Unfortunately, they are essentially worthless with regard to covert non-forced entry.