Lerp moving in one frame

Unity Engine
1 
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DoorTrigger : MonoBehaviour
{
    public GameObject door;
    public GameObject openDoor;
    public GameObject closeDoor;

    Vector3 NewPos;
    Vector3 EndPos;

    void OnTriggerStay(Collider col)
    {
        NewPos = openDoor.transform.position;
        EndPos = closeDoor.transform.position;
        door.transform.position = Vector3.Lerp(door.transform.position, NewPos, Time.deltaTime);
    }

    void OnTriggerExit(Collider col)
    {
        NewPos = openDoor.transform.position;
        EndPos = closeDoor.transform.position;
        door.transform.position = Vector3.Lerp(door.transform.position, EndPos, Time.deltaTime);
       


    }

}

I have this code, but the second Lerp only moves the object once in one frame and depending on the time it moves into position in one movement not smoothly, or just moves a fraction and doesn’t reach it’s target/ how do I fix this

2

OnTriggerExit is only called on the single frame that the collider exits the trigger volume.
Have a look into animations (and animate the door), or coroutines (to run the code for mulitple frames)

3

How would a coroutine work for this

4

OnTriggerExit { StartCoroutine(CloseTheDoor) }

Or similiar

5

Or start with any one of the four million videos out there covering this extremely common basic process.

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