Play Oneshot Audio On Touch

Hello everyone!

I have a script that plays audio on touch, and in that sense it works just fine. I have been working to make it so that when you click something to play an audio file, you can't que the audio file again while it's playing. But the way the script is now, the audio never plays again at all, ever. Even after the audio is done playing. Although sometimes right after finishing playing it will let me click it again. It's finicky! Take a look if you have a moment:

 public class PlayAudioOnTouch : Touchable
 {
     private int _timer = 0;
     public override void OnStartTouch () 
     {
         if(_timer == 0)
         {
             if( audio != null ) audio.Play();
             base.OnStartTouch();
             _timer = 1;
         }
         else if(_timer > 0 && _timer <= Time.time)
             _timer++;
         else
             _timer = 0;
         
     }
     
     public override void OnEndTouch ()
     {
         base.OnEndTouch();
     }
 }

If I were to put money on the source of the problem. I would say use of "Time.time" is what's cuasing these issues. I think using something else in lue of that would work better, but I don't know what to use. Any input would be more than welcome. Thanks for taking the time to look at my question!