Move character up to point in Unity3D

I have a problem, I need my character to move a certain distance when I click the button, until then I can do it.

The problem is that when I do, he does not "walk" to the point, he kind of "teleports", and that's not the intention. I need him to automatically walk this distance.

Can anyone help me?

using UnityEngine; using System.Collections;

public class movement: MonoBehaviour {

public float posicao = 2f;
private bool clickBaixo;
private bool clickCima;

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {

    clickBaixo = moveDown.getBaixo();
    clickCima = moveUp.getCima();

    if(Input.GetKeyDown("up") || clickCima == true){
        transform.Translate(0,posicao,0);
    }

    if(Input.GetKeyDown("down") || clickBaixo == true){
        transform.Translate(0,(posicao)*-1,0);
    }
}

}

Updated:

using UnityEngine; using System.Collections;

public class movement: MonoBehaviour {

public float posicao = 2f;
public float vel = 10f;
private bool clickBaixo;
private bool clickCima;
private float novaPosicao;

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {

    clickBaixo = moveDown.getBaixo();
    clickCima = moveUp.getCima();

    if(Input.GetKeyDown("up") || clickCima == true){
        StartCoroutine("moveCima");
    }

    if(Input.GetKeyDown("down") || clickBaixo == true){
        StartCoroutine("moveBaixo");
    }
}

IEnumerator moveCima(){
    novaPosicao = transform.position.y + posicao;
    while(transform.position.y<novaPosicao){
        transform.Translate(0, vel*Time.deltaTime, 0);
        yield return null;
    }
}

IEnumerator moveBaixo(){
    novaPosicao = transform.position.y + posicao;
    while(transform.position.y<novaPosicao){
        transform.Translate(0, (vel*Time.deltaTime)*-1, 0);
        yield return null;
    }
}

}