App Protection Workflow using Face ID / Touch ID

I have successfully added Biometrics to my app, so that users can use Touch ID / Face ID to unlock and use the app.

Right now, I want to implement immediate lock once user leaves the application (applicationWillResignActive), and thus requires Biometrics check when becoming active (applicationDidBecomeActive).

Question:

How can I skip the authentication only if the app is temporarily interrupted?