Padlock retaining device

1. A door locking and unlocking system comprising:

a) a roll-up door that can move to an open position from a closed position, the door being proximate to a structure separate from the door;

b) a locking mechanism including a slide slidable relative to the door and structure for locking the door in the closed position, the locking mechanism being lockable with a lock for preventing the slide from sliding, a first part of the locking mechanism being attached to the door and a second part of the locking mechanism being attached to the structure proximate the door; and

c) a lock retaining device not part of the locking mechanism, the lock retaining device comprising a body section secured to the structure and not secured to the door, the lock retaining device comprising a lock containment section attached to and extending away from the body section, the lock containment section having a retaining hole for receiving the lock.

2. The system according to claim 1 , wherein the body section of the lock retaining device is planar.

3. The system according to claim 1 , wherein the body section of the lock retaining device comprises at least one fastener hole.

4. The system according to claim 1 , wherein the lock containment section extends away from the body section at a 90 degree angle with respect to the body section.

5. The system according to claim 1 , wherein the lock retaining device is made from a single plate of steel.

6. The system according to claim 1 , wherein the body section of the lock retaining device is 2 and ⅜ inches tall.

7. The system according to claim 1 , wherein the body section of the lock retaining device is 1 and ⅞ inches wide.

8. The system of claim 1 , further comprising a lock for locking the locking mechanism with the door in the closed position.

9. The system of claim 1 , wherein the body section of the lock retaining device is in the shape of a body portion and shackle of a padlock.