Smooth movement when input is pressed

Well, I'm beginner in t$$anonymous$$s and my question is how to move an object to it's right smoothly when player pressed right? I've tried t$$anonymous$$s, but I've to keep pressing the button. I want only one push button and the object move until the destination.

     var smoothTime = 0.3;
     var isMoov = false;
     private var velocity = Vector3.zero;
     
     function Update () {
         if(Input.GetButton("Horizontal")){
             var in_direction : int = Input.GetAxis("Horizontal") < 0 ? -1 : 1;
             if(in_direction == 1){            
                 
                 var targetPosition : Vector3 = Vector3(25, 25, 25);                               
                 transform.position = Vector3.SmoothDamp(transform.position, targetPosition,
                                      velocity, smoothTime);
             }            
         }    
     }