When you open the door without unlocking it from the inside, if you go outside and close the door will it still be locked?
No, this door knobset does not have that capability. This Schlage FA51-AND has a Panic Proof turn button on the inside, so whenever you turn the knob, the entire knobset is unlocked. You would have to either use the key to re-lock from the exterior or you would need to use the interior turn-button lock on your way out the door. If you need a knobset that will be fixed in the locking position on the exterior without always having to lock it, then you may want to look at "Storeroom Locks". The exterior knob/lever is always locked and can only be unlocked from the exterior by using a key. The interior knob is always unlocked so you would not even need to use a push-button to open the door, simply turn and the exterior will remain locked.