How can i change the camera view when clicking a button ?

I added enum with all the views options. But when i click/press on V nothing happen with the game is running.

using UnityEngine;

public class FollowTargetCamera : MonoBehaviour
{
    public enum Views
    {
        Forward, Backward, Left, Right
    }

    public Transform Target;
    public float PositionFolowForce = 5f;
    public float RotationFolowForce = 5f;

    public Views views;

    void Start()
    {

    }

    void FixedUpdate()
    {
        Vector3 vector = new Vector3(0, 0, 0);
        Vector3 dir = new Vector3(0, 0, 0);

        if (Input.GetKeyDown(KeyCode.V))
        {
            switch (views)
            {
                case Views.Backward:
                    vector = Vector3.back;
                    dir = Target.rotation * Vector3.back;
                    break;
                case Views.Forward:
                    vector = Vector3.forward;
                    dir = Target.rotation * Vector3.forward;
                    break;
                case Views.Left:
                    vector = Vector3.left;
                    dir = Target.rotation * Vector3.left;
                    break;
                case Views.Right:
                    vector = Vector3.right;
                    dir = Target.rotation * Vector3.right;
                    break;
            }
        }
        dir.y = 0f;
        if (dir.magnitude > 0f) vector = dir / dir.magnitude;

        transform.position = Vector3.Lerp(transform.position, Target.position, PositionFolowForce * Time.deltaTime);
        transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.LookRotation(vector), RotationFolowForce * Time.deltaTime);
    }
}

case views = Views.Backward:

or Just replace entire switch section with number is elifs