Iirc You need to learn it from chris, then just move the arrows to the middle using WASD, some chests will need chris to be in your team to lockpick it
Gotchya, I struggled with the lock pick on the princess's cage. I was trying to get the arrows to the middle but 2 of the arrows would counter each other. I couldn't maneuver them to the middle because of that. No matter how many ways I tried.