What is the best way to convey "This window is non-editable info right now, but you can click here to edit it" on macOS?

I'm looking to create a macOS UI that lists some information about an item. If the user has sufficient permissions (i.e. is an Admin), they should be able to turn this read-only info UI into a read-write one.

The first thought was, of course, to make it a window/panel with a button that says "Edit". Upon clicking that button, all deactivated controls would be activated and the user would be able to edit the form.

Then I remembered that, around the system's UI, there are little locks like this, which do essentially what I'm trying to do:

Two windows, on the left the System Preferences' Users & Groups pane, on the right the Get Info pane for a file. The left has a modestly-sized orange padlock icon with the text "Click the lock to make changes." The right has a small orange lock with no text.

Is this a good UI for this? Is there a better one that I'm not thinking of? A pencil in the title bar or something? I would love any thoughts ?

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