MirroSwitchMock.cs

using UdonSharp;
using UnityEngine;
using VRC.SDKBase;
using VRC.Udon;

public class MirroSwitchMock : UdonSharpBehaviour {
    public GameObject mirror;

    public override void Interact() {
        if (this.mirror == null) {
            Debug.Log("The mirror has not set.");
            return;
        }

        this.mirror.SetActive(!this.mirror.activeSelf);
    }
}