How to make smooth moving?

I made a script, but thinks in the script is moving instatnly on position. i'd like it mooving slowly on this place. Script is looking this style: using UnityEngine; using System.Collections;

public class InventoryMove : MonoBehaviour {

 private Vector3 velocity = Vector3.zero;
 public string name;
 public int invpos;
 private Vector3 mover;
 public GameObject Point1;
 public GameObject Point2;
 public GameObject Point3;
 public GameObject Point4;
 public GameObject Point5;

 // Use this for initialization
 void Start () {
     
 }
 
 // Update is called once per frame
 void Update () {
     
     if (Input.GetButtonDown("InventoryMoveLeft")){
         invpos = invpos - 1;
         if(invpos == -3){
             invpos = 2;
         }
     }
     if (Input.GetButtonDown("InventoryMoveRight")){
         invpos = invpos + 1;
         if(invpos == 3){
             invpos = -2;
         }
     }
     if(name == "Hand"){
         if (invpos == 0){
             
             mover = Point1.transform.position;
         }
         if (invpos == 1){
             mover = Point2.transform.position;

         }
         if (invpos == 2){
             mover = Point3.transform.position;

         }
         if (invpos == -1){
             mover = Point4.transform.position;

         }
         if (invpos == -2){
             mover = Point5.transform.position;

         }

     }

     transform.position = mover;
 }

}