How to unlock the Dock in macOS Sierra? While using a brand new MacBook Pro, with Touch Bar, somehow the Dock got locked.  I didn't do anything that I know of.  Nothing moves at all, in or out.  I'm trying to remove and add items, apps, and nothing takes.
Try logging out and back in (or, if you're comfortable with the Terminal, try running killall Dock). That will cause the Dock to relaunch and may un-freeze it.