I have more than one store, and I'm seeing the Locksmith page for the wrong one.
Sometimes, when working with multiple stores, caching on your browser can show you the wrong Locksmith admin area. This can be a bit confusing when you see locks for another store, and you're not getting to the one you need.
To get around this, head over to https://uselocksmith.com and log in there with your shop.
You'll be presented with the same Locksmith interface as you would from the apps page in Shopify, but for the correct store. :)