Chapter 8 - Soldier's Field
Once you've entered the Soldier's Field Welcome Center turn left and you'll encounter a locked door leading to the security office. You can open this door with one lockpick.
Check the study located on the other side of the door and you'll uncover a locked safe. Unlocking this safe is possible only if you have 5 lockpicks.
There's a weapons upgrade station at the end of the ticket hall, near a kinetoscope. Locate closed doors here and use 2 lockpicks to open them.
Chapter 12 - Return to Hall of Heroes
Once you've entered the Patriot's Pride Pavilion you'll come across a hostile construct armed with a Crank Gun. Destroy the automaton and make sure to explore the office marked with the "Employees Only" sign. Opening the door to this office requires only 1 lockpick.
The office you've unlocked contains a safe and in this case you'll need 5 lockpicks.
Chapter 16 - Worker Induction Center
Enter the main hall of the Worker Induction Center and proceed to the left side of the room. Ask Elizabeth to break the lock on a door leading to a side office (she will need 5 lockpicks).
There is a room opposite the elevator on the lower level of the Worker Induction Center. Explore this room to find a safe and open it with 1 lockpick.
Chapter 17 - Plaza of Zeal
There is a watchmaker's store to the right of the job fair. Breaking in means sacrificing only 1 lockpick.
Chapter 18 - The Good Time Club
You'll find a study on the first floor of the club. Check one of the corners near a huge clock behind the desk to locate a locked safe. Opening this safe requires 3 lockpicks.
Get to the prison located in the club's underground area. Ask Elizabeth to break into cell number 8 (the lock requires 5 lockpicks).
Chapter 22 - Bull House Impound
You'll find a locked armory on the left side of the building's first floor. Gaining access to the armory is only possible if you have 5 lockpicks.
Chapter 28 - Emporia
Enter the gondola station and find a locked gate to the left. Ask Elizabeth to break the lock (she will need 5 lockpicks).