Which of the following is not true with regard to lock and key systems?

A high-quality pickproof lock is indeed considered a positive barrier to entry, making the assertion that it's not true incorrect. Such locks are designed with advanced mechanisms that make them significantly more difficult to overcome by traditional picking methods, hence they enhance the overall security of a locking system.

The perception that a pickproof lock stands as a reliable form of security contributes to its usage in a variety of applications where the potential for unauthorized access needs to be minimized. While no lock can provide absolute security on its own, a quality pickproof lock serves as an effective deterrent and complements a broader security strategy that includes other measures such as surveillance and alarm systems. This holistic approach underscores the importance of combining various security devices to create a comprehensive security solution.