Video Description:

Thief - Focus on the Tasks at Hand - Pick a pocket and a lock using the focus ability [Bronze / 5G]

To do this you must first upgrade the Focus ability "Dexterity" to its maximum level. You can buy focus upgrades from the Beggar's Queen in the most northern part of The City.
After you've upgraded Dexterity, head to the glowing gate around the corner to start Chapter 2 (can be replayed at the same location if you've already beaten it). In the beginning of chapter 2 is a guard with two pockets and a locked door. Activate focus vision and pick the guard's pocket, as well as the lock of the closed door.

You can then pause the game and click "Return to the City" to get back to the Beggar's Queen.