Master of Unlocking Achievement/Trophy
This is a fairly simple achievement/trophy which requries you to unlock something with a lock pick. The earliest you can do this is just after escaping Jack Miller for the first time and entering the hatch, you will come across a laundry room and by the door in this room will be an orange box, examine it and you will be able to open it and take the lock pick.
Now that you have the lock pick simply walk out the door (It is safe) and turn right, follow the path down and past the double doors will be a table that you can unlock.
Here is a video in case you are stuck.