Locking products by tag
Locksmith won't lock by tag using the Locksmith search bar. The good news is that you can make this happen with an automated collection in Shopify.
1. In your Shopify Admin, click on Products then Collections
2. In the upper right, click Create Collection
3. Name your collection something relevant, and then scroll down and click on the Automated option for the collection.
4. In the conditions area, choose "Product Tag... is equal to" and then add your product tag into that field:
5. Click Save.
Once that's done, search for your new collection by name in the Locksmith search bar, and lock it that way. You'll likely want to enable the "hide from search and lists" option on that collection lock.
Any time you tag a new product with that tag, it'll automatically be in that collection and therefore locked by Locksmith. :)