www request ienumerator function doesn't work

hi guys, i have a code that is supposed to do a simple GET on a server, but apparently everything in the getunlockedvalue() doesn't get executed.

Simply put Debug log shows me Debug.Log("pre funkcije") but doesn't show me Debug.Log("I am here dammit!") which makes me think getunlockedvalue() is not working at all.

 public Text mytext;
 public InputField un, pass;
 public Button Continue_button;
 string username, password;
 string unlocked;
 string enkodovan_name;

 // Use this for initialization
 void Start () {
     Continue_button = GetComponent<Button>();
     mytext = GetComponentInChildren<Text>();
     Continue_button.onClick.AddListener(ProcessText);
     
 }
 void ProcessText()
 {
     mytext.text = "Loging In...";
     Continue_button.enabled = false;
     username = un.text;
     password = pass.text;
     enkodovan_name = WWW.EscapeURL(username);
     if ((username=="1") && (password == "1"))
             Application.LoadLevel("biraj_kulturu");
     Debug.Log("pre funkcije");
     getunlockedvalue();

 }

 IEnumerator getunlockedvalue()
 {
     Debug.Log("I am here dammit!");
     WWW otkljucano = new WWW("http://localhost/php_check_password.php" + "?email=" + enkodovan_name + "&password=" +    password); //GET data is sent via the URL

     while (!otkljucano.isDone && string.IsNullOrEmpty(otkljucano.error))
     {
         Debug.Log(otkljucano);
         yield return unlocked = otkljucano.text;
         Debug.Log(unlocked);
         if (unlocked == "true") { 
         PlayerPrefs.SetString("unlocked", "true");
         PlayerPrefs.SetString("culture", "none");
         PlayerPrefs.SetString("email", username);
             Application.LoadLevel("biraj_kulturu"); // Think about adding a screen that says congratulations, you unlocked the game. Bla Bla...
         }
         Debug.Log(unlocked);
     }

     if (unlocked == null) 
     Debug.LogWarning(otkljucano.error);
     Continue_button.enabled = true;
 }
 // Update is called once per frame
 void Update () {
     
 }

}

Any help is much appreciated...