Possible secret doors in Docks District

i just need to know if these can be opened somehow: theres a door with an unconventional lock in the first level of the Shadow Thieves house, just to the right after you enter the building; on Edwins floor in MaeVars building, theres a door that on close inspection appears to be just a painting on the wall or something like that; fi you go into the barracks in the Docks, you finally get to a path on the outside of the docks wall that leads to a door that is barred from the inside - a similar door can be found on the south wall of the shadow thieves building. any way to unlock any of these?
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The two other doors ... well, you didn't think that a highly visible building was the entire thieves' guild, did you? You need a key to go through those doors, and you will get that key in the chapter 3 plot (You're given the key if you side with the guild, and have to take it by force if you side against them).