I have a Schlage Z-Wave Connect Smart Deadbolt, Model FE469NX. After I added the Z-Wave lock to the ISY, the ISY showed 6 device nodes (see image below).  5 with the bell icon are for lock alarms. The 6th is a door icon and represents the actual lock/unlock mechanism.

To unlock the lock, I created a scene on the ISY called “Pantry Front Door – Unlock” which I exported to the Elk.  I believe you could do the same by importing the actual device instead, but I see you didn’t have any luck using that approach.

Once imported to the Elk, it is referenced it from the Lighting tab.  I set the Type as “On/Off Switch”.

I created a Rule on the Elk that, when triggered, issues the following command to run my scene on the ISY to unlock the door:

WHENEVER <YOUR DISCRETE EVENT>
THEN TURN Pantry Front Do [2 (A2)] ON, FADE RATE = 0

I realize FADE RATE isn’t relevant to the lock, but Elk automatically includes it.  I assume it’s ignored.