The chest is behind it and you will
need lockpicking skill at level 3 atleast to unlock it.
Where in Infinite, Elizabeth picked however many locks needed picking as long as Booker had enough lockpicks to cover it, here you not only
need the lockpicks, but you get to do it yourself.
If
you need lockpicks to unlock specific chests in the area, then you best make sure you have an afternoon in the real world to sit and make them.
Not exact matches
There's other things to find aside the tablets as you play, there's chests that
need to be unlocked by a crew member that has the
lockpick ability.
If you want to get better at thieving you simply
need to pickpocket or
lockpick more or get into more fights if you want your strength or sword fighting to go up.
However, you only
need this one
lockpick code to open any lock since all codes do the same thing.