Continue to turn at this point and you risk snapping the bobby pin. Too much resistance means you're in the wrong spot. Turn the bobby pin first and you'll feel resistance through the gamepad. You now must turn a screwdriver one way and the bobby pin another until it unlocks.
You can pick Novice locks provided you have a bobby pin. Here's how to make sure you clear up all the goods you can.
Guns, ammo, meds, information and alternate routes are hidden away behinds locked doors, computer terminals, inside crates and in safes. There's a lot of hidden goods in Fallout 4, just out of your normal reach. Don't miss out on what's behind that door, in the safe, or hidden on the computer terminal.