[@PaulHaynek]
So, here I'm asking for some clarification on the rules:
I wasn't trying to cure any fetter in conversing with Greene, just asking him some questions. Would I have needed to roll for that, as I did? Because if not I would have rolled to open the door regardless. 

To get somewhere I simply rolled for both now. However, if I had to make a conversation check with Greene for the sake of getting some answers then simply don't count Yuno opening the door (or have her fail regardless).