Okay so I recently created a new character to aid in my other ones that I have. I took on Treasure Hunter and I have the basic skills - but I am trying to open some chests like one from Miasma and a few from a Dark Wisp Paragon and they arent opening. So Im sure i have to get my lockpicking up. But how?

Now, I know you all have posted in this forum but I am not comprehending what it is I should be doing. If someone could explain a simple way for me to do this that would be great.

My lockpicking is 85.1
My Magery is 70.0
My Cartography is 85.0
and I have some musicianship

So what hints / tips can be shared with me?
Id appreciate so much