Interact with objects based on distance.

I know there seem to be plenty of answers out there for this, but literally none of them work in this case (Especially not that hour long tutorial on youtube that everyone links to, that makes it worse). So I have a script (that I attach to the objects I want to interact with) that is supposed to make it so when the player is within a certain range of the objects they can use them. That part works fine. The objects themselves are of differing sizes, however, so making some way to tell if the player is "facing" them is damn near impossible for me to figure out.

Here is the code as it is now (some of it was following the hour long "opening and closing doors" tutorial on youtube, which doesn't help and gives me wildly inaccurate detection):

 var player : GameObject;
 var opened : boolean;
 var not_opened_color : Color;
 var opened_color : Color;
 var model : GameObject;
 var interact_distance : float = 5.0;
 var can_interact : boolean;
 var PI : float = 22/7;
 var angle : float;
 var current_angle : float;
 
 function Start () {
 
 player = GameObject.FindGameObjectWithTag("MainCamera");
 not_opened_color = Color.green;
 opened_color = Color.red;
 
 }
 
 function Update () {
 
 angle = Vector3.Angle(transform.position - player.transform.position,(transform.position + (player.transform.right * transform.localScale.magnitude)) - player.transform.position);
 current_angle = Vector3.Angle(transform.position,player.transform.forward);
 
 if(Vector3.Distance(transform.position,player.transform.position) <= interact_distance && opened == false)
 {
     if(current_angle < angle)
     {
     can_interact = true;
 
         if(Input.GetKeyUp(KeyCode.E))
         {
         Debug.Log("Interacting");
         opened = true;
         }
     }
     else if(current_angle >= angle)
     {
     can_interact = false;
     Debug.Log("Facing Away");
     }
 }
 else if(Vector3.Distance(transform.position,player.transform.position) > interact_distance || opened == true || current_angle < angle)
 {
 can_interact = false;
 player.GetComponent(InteractorScript).can_interact = false;
 player.GetComponent(InteractorScript).current_object = null;
 }
 
     if(opened == true)
     {
     model.renderer.material.color = opened_color;
     }
     else
     {
     model.renderer.material.color = not_opened_color;
     }
 
 }
 }
 
 function OnGUI () {
 if(can_interact == true)
 {
 GUI.Box(new Rect(Screen.width / 2 - Screen.width / 32, Screen.height / 2 - Screen.height / 64, Screen.width / 16, Screen.height / 32),"[E]Open");
 }
 
 }