Quaternion.lerp issues

So, I’m very new to Unity and C#. I’ve written this script and I’m having some issues with it. Here it is:

using UnityEngine;
using System.Collections;

public class DoorMovements : MonoBehaviour
	public Transform start;
	public Transform end;
	public float speed;
	void DoorOpen ()
		transform.rotation = Quaternion.Lerp (start.rotation, end.rotation, Time.time * speed);
	void Update ()
		if (Input.GetButtonDown ("Fire1")) 
			DoorOpen ();

It works, except instead of the object I want to move (a door) moving slowly, it moves instantly. Any ideas on what I’m doing wrong?


Lerp’s third parameter should be between 0 for start position and 1 for end position. So it should be something like (Time.time - startTime)/(endTime - startTime) where endTime is time when it’s supposed to reach end point and startTime is time when movement started. When starting rotation I’d do

startTime = Time.time;
endTime = startTime + Quaternion.Angle(start.rotation,end.rotation) / speed;

with startTime and endTime defined as floats in class.