Rotatable door lock with integrated security feature

A housing having a lockable door panel, comprising:

• a housing having a first opening and a second opening therein, the second opening being spaced from the first opening, the second opening being defined by a wall having a first end and including a generally circular central portion and two elongated side portions extending radially from substantially opposite sides of the central portion, at least one locking recess extending radially from the central portion beneath at least part of the wall;
• and
• a lockable door panel, the lockable door panel including
• a lock cylinder including a generally circularly cylindrical body having a first end and a second end, one or more members extending radially from proximate the first end of the body, and a passageway extending substantially radially through the body between the first end and the second end, and
• a door panel of sufficient size to cover the first opening and the second opening, the door panel having a generally circularly cylindrical door panel opening therein for receiving the lock cylinder, the door panel opening being defined by an inner wall extending from an inside of the door panel at a first end thereof to an outside of the door panel at a second end thereof, and receiving the lock cylinder such that the second end is disposed proximate the second end of the inner wall and the one or more members are disposed longitudinally beyond the first end of the inner wall, and two door panel recesses in the outside of the door panel leading to the opening such that, when the lock cylinder is turned to a locking position relative to the door panel, the passageway is accessible through both of the door panel recesses, the door panel recesses defining protrusions on the inner wall of the door panel,
• wherein, when the lockable door panel is moved to a closed position to cover the first opening and the second opening, the lock cylinder is received in the central portion of the second opening and the protrusions defined by the door panel recesses are received in the elongated portions of the second opening, and when the lock cylinder is turned to the locking position, the at least one member is received in the at least one locking recess.