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Just a guess but it looks like the grey piece is the lock, so you should be able to move that piece outwards from the far left side.
If correct you should see a tab of some sort inside the grey housing(far left), unlatch it with a flat screw driver and pull the grey piece towards you?
Thanks for the response guys. There's a tab that's kind of hidden, push in and lift up and the plug comes out. Pretty simple. I'm always scared to break tabs.