C# Script The same Input play two animations every time

For my new project I have two animations. One for Open and the secondone for close. I would like if I press Input 4 play open, but if I press the input 4 again and play open its true play close.

My script is this:

public class OpenandCloseCortinas : MonoBehaviour {

public Animation anim;

 public bool animopen;
 public bool animclose;




 // Use this for initialization
 void Start()
 {

     anim = GetComponent<Animation>();

     anim["Open2"].wrapMode = WrapMode.Default;
     anim["Close2"].wrapMode = WrapMode.Default;

 }

 // Update is called once per frame
 void Update()
 {
     if (Input.GetKey("4") && anim["Open2"].enabled == false)
     {
         anim["Open2"].enabled = true;
         anim.Play("Open2");
     }

     else if (Input.GetKey("4") && anim["Open2"].enabled == true)
     {
         {
             anim["Close2"].enabled = true;
             anim.Play("Close2");
         }

     }
 }

}

I need help? what is wrong? I'm stating now with scriptting