Audio does not finish playing whenever I press another key

Hi, I have a 5-second audio that I want to play if I click my left mouse button. However, whenever I try to press another key in my keyboard, the sounds stop playing. It does not finish playing the audio.

Thanks in advance :)

Here's my code:

 public AudioClip mySound1;
 AudioSource audio;


 // Use this for initialization
 void Start () {
 

     audio = GetComponent<AudioSource>();
 
 }
 
 // Update is called once per frame
 void Update () {


     if (Input.GetButtonDown("Fire1")) {
             audio.PlayOneShot (mySound1);

             }
 }