Goal: Discover the trick to how the key and the lock function together to open the lock. For over 6000 years, humans have used some form of lock to secure their goods from would-be thieves and malcontents. The most common lock is the padlock or ‘Warded Lock’ and is credited to famed Greek Inventor and sculptor Theodorus of Samos. Theodorus is known for his work in bronze casting and the development of tools such as the lathe, the key, the level and more. It is said that Theodorus invented a lock so challenging, that not even the most skilled thieves of the time could crack it.