Combination Locks
Combination Locks
These locks are used so that the submissive can be locked and only be allowed out once he or she has the combination. Additionally, one could use these locks to put a "time barrier" on their chastity lockup so they would have to potentially guess every possible combination. In addition, one could use these locks for long distance chastity, which is better explained in the Games & Ways to Play section.
Luggage/Suitcase Lock

These locks allow the keyholder to not be present while keeping the submissive locked. He or she can reset the combination to a number they see fit and lock up the submissive. If the Dominant or submissive are going to be apart, this allows the Dominant to let the submissive out by sending them the code. Additionally, the submissive may try to guess the combination, but this involves up to 1000 guesses of the combination. To add to this, the Dominant may add vaseline to the number dials to make it much more difficult to guess these numbers. If the submissive can guess 1 combination every 3 seconds, the submissive must dedicate about an hour to trying to get out.
Realtor's Lockbox
Realtor's Lockbox

Once the submissive has been locked in chastity, the keys may be placed into one of these locking boxes. The Dominant can set the combination to something custom and enclose the keys into the lockbox. From here, the submissive is in a tighter bind, as a 4-digit box would take roughly 10 hours of constant guessing to try all possible combinations.
What separates this device from the combination lock above is that these boxes can be attached to walls, ceilings, or anything else that accepts screws. The Dominant may set this up somewhere awkward such as the ceiling of a basement, an awkard section in a closet, or even run metal cables through something like a tree out in the winter, forcing the submissive to spread out their guessing over time if they want to get out earlier.
Timed Locks
Timed Locks
These locks allow the Dominant (or submissive doing a self-lock) to set a predetermined amount of time for the submissive to stay locked. This removes the possibility of the submissive getting lucky and guessing their way out of being locked.
Luggage Lock Countdown Timer

This device attaches directly to a chastity device and can be set for a predetermined amount of time. A Dominant may put a submissive in chastity and then set the lock for a set amount of time. Additionally, time may be added as desired, so a Dominant could continuously add time if desired. Added time may be added if the submissive does not follow commands or behaves inappropriately. Or it could be added because the Dominant feels like it.
Kitchen Safe

This clever device was made for snack foods or addictive things like cigarettes or cell phones. However, the Dominant may decide to lock the keys in this safe and set a lockup time. These devices can be set between 1 minute and 10 days. For an added twist, a Dominant may take something like the lockbox above and place it in the Kitchen Safe, forcing the submissive to wait up to 10 days before being allowed to start guessing the lockbox combination.
ChronoVault - Internet Controlled Key Safe

This device allows the Dominant to lock keys inside of a very sturdy hard plastic safe. The device plugs into a computer to connect to the Dominant's account, where he or she can add or remove time for their locked submissive.
Found at Dream Lover Labs
Puzzle Locks
Puzzle Lockbox

This toy tests the submissive's ability to move a ball through a maze. The keys can be placed inside this safe and the submissive can be allowed to try and solve the puzzle. Additional twists to the game can involve the submissive being a little inebriated via alcohol or other legal drug, or the submissive can be given a short amount of time to try and crack the puzzle.