How to use the howler.Howler.unmute function in howler

unmute() {
    Howler.unmute();
    this.blockMute = false;
  }

onWindowFocus() {
    if(this.blockMute) return;
    
    Howler.unmute();
  }

static set muted(value) {
    if (value) {
      muted = true;
      Howler.mute();
    } else {
      if (!enabled) {
        return;
      }
      muted = false;
      Howler.unmute();
    }
  }