Because this is a secure device, the initial pairing has to be within “whisper range” of the hub so that the security key can be exchanged between the lock and hub. Once you’ve done that, you can move them apart again.
Wi-Fi isn’t going to help because the SmartThings hub doesn’t have a Wi-Fi radio in it. But you could use a Wi-Fi access point that has an ethernet port and plug the hub into that. That’s probably going to be the easiest thing in your situation.
In addition, Schlage locks are a little bit tricky to pair. See the following FAQ (this is a clickable link) and follow the instructions exactly.
But it’s a good lock and very popular and once you get it paired there’s nothing quirky about it. It’s just that first step.
