While exploring the game, it's important to grab every single pocket secretary device you come across, and always hack laptops whenever possible to read the emails within. In some cases, you might not have spent enough Praxis to unlock the toughest locks, however.
Something like a locked door is no match for augmented super human Adam Jensen, though, with his advanced hacking abilities. From Dubai to Prague to the slum Golem City, there's a whole lot of secured laptops and sealed doors trying to prevent you from finding all that sweet loot and secret intel.