Tired of Lockpicks breaking, and your nowhere near the 100 Lockpicking skill needed to make lockpicks unbreakable?
This is for you...
1. If you have not joined the Theives Guild, go ahead and do so by talking to Brynjolf at the plaza in Riften.
2. Do all of the missions given by Brynjolf, Mercer Frey, and eventually Karliah.
3. Once you find out Mercer has betrayed the guild, you go to Irkngthand to find Mercer.
4. At Irkngthand, after you find Mercer, you are to kill him.
5. After Mercer is dead, go loot his body. You can take his weapon, some gold, Both Eyes Of The Falmer(only 1 is needed), and the Skeleton Key.
6. Karliah tells you to take the Eye of The Falmer to Delvin, and the Key back to Nocturnal.
7. You can take the Eye to Delvin, but keep the key. The key is an unbreakable lockpick. Use they key to pick any locks until you reach level 100 lockpicking skill and get unbreakable lockpicks, you can ten, return the key.