I think you’re confusing the role of a Device Handler (DH) and SmartApp (SA). The DH is responsible for creating an interface to the lock and exposing the ability to use all it’s features (this is what this Universal Z-Wave Lock DH does, it exposes the ability to use all the features on the various Z-Wave locks).
The SA creates use cases/stories that allows the users to make meaning use of devices, in your case the ability to program/schedule/manage users on locks. The SA you’re looking for to this is here:
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