Find out if Audio Source has finished playing clip

Is there a way to get the Audio Source's clip's current PlaybackPosition or similar so I could find out if the source has finished playing the clip. There seems to be no event attached to the source and using the IsPlaying cannot be "simply" used. If I poll the IsPlaying every frame, pausing (or minimizing/suspending the game) all Audio Sources would trigger the wrong code section to execute eg.

 void Update()
 {
     if (!audioSource.IsPlaying)
     {
         // Assume audioSource has finished playing a clip.
         // Do work.
     }
 }
 
 void PauseAllAudioSources()
 {
     foreach (var source in FindObjectsOfType<AudioSource>())
     {
         source.Pause();
     }
 }

or

 IEnumerator CoroutineMethod()
 {
     yield return new WaitUntil(() => audioSource.isPlaying == false);
 }

If I use the "Coroutine waiting method" eg.

 IEnumerator WaitForSound(AudioClip clip)
 {
     audioSource.Clip = clip;
     audioSource.Play();
     yield return new WaitForSeconds(clip.length);  // why is length lower case anyway
     // Do work.
 }

pausing would still break the code, but also the clip's length could be modified by audio effects. It seems like there is no way to do it "the right way", so how can do this somewhat correctly, or do I have to code a somewhat complicated Audio Manager?