question

Why does a return function like this always turn null? Are turn functions returning before the results are queried? If so how would you go about making a function that returns the values after the query?

 public string GetUserNameData(string myPlayFabeId, string slot)
    {       
        string tempName = "";
        PlayFabClientAPI.GetUserData(new GetUserDataRequest()
        {
            PlayFabId = myPlayFabeId,
            Keys = null
        }, result => {
            Debug.Log("Got user data:");
            if (result.Data == null || !result.Data.ContainsKey(slot + "_" + "PlayerName")) 
            {
                tempName = "Empty Slot";
                Debug.Log("No Name"); 


            }
            else
            {
                tempName = result.Data[slot + "_" + "PlayerName"].Value;


                Debug.Log("PlayerName: " + result.Data[slot + "_" + "PlayerName"].Value);
            }
        }, (error) => {
            Debug.Log("Got error retrieving user data:");
            Debug.Log(error.GenerateErrorReport());
        });
        Debug.Log(slot + "___tempName : "  + tempName);
        return tempName;
    }