A rotatable lock pin that inhibits forced entry into a container through a closure by securing the lock pin to the container. A lock pin has a pin cylinder with a curvature of rotation that engages with a rotation facilitator. The path of the curvature of rotation and the engagement of the rotation facilitator therewith causes the lock pin to rotate in a pre-determined fashion, so that structures on the lock pin can engage or attach to some part of the container to secure the position of the lock pin and hold the closure door in place. Lock pins of the subject invention utilized with safes can inhibit forced entry through the door by side punching or prying of the door.