What is the most common form of physical access control?

The most common form of physical access control is keys and locks. This method has been used for centuries and is one of the simplest and most straightforward means of securing a physical space. Keys and locks are widely understood, easy to implement, and cost-effective for securing doors and access points in residential, commercial, and institutional settings.

This form of access control ensures that only authorized individuals who possess the correct key can enter a secured area, providing a clear barrier to unauthorized access. The familiarity of keys and locks also contributes to their prevalence, as they do not require any special training or technology for everyday users, making them accessible and practical for a wide range of applications.

While other options like electromagnetic locks, FOB access, and swipe card systems offer higher technology and often advanced features like audit trails or remote access, they are not as universally implemented as keys and locks. Key and lock systems remain a foundational element in the hierarchy of physical security controls.