How can i rotate both NPCS facing the door moving to the door and then...?

For the rotation you should look at the MoveRotation documentation for unity. This will allow you to smoothly rotate a rigidbody a certain way. You can use a random number to determine which way the will rotate like:

using UnityEngine; using System.Collections; public class ExampleClass : MonoBehaviour { public Rigidbody rb; public float randRotation; float speed = 1.0f; void Start() { randRotation = Random.Range( 0, 1); //0 or 1 rb = GetComponent<Rigidbody>(); } // fixedDeltaTime provides the same time that FilterUpdate() uses void FixedUpdate() { if (randRotation == 0) { //Rotate character left }else{ //Rotate character right } } } 

What I recommend for you to take a look at for the patrolling is the usage of a waypoint system. If you want all guard to patrol that is. It basically is an array of points which the guard shall walk too. You can make this random or structured.

I found a good answer on the Unity forum Just to be sure I will copy the code he showed into this answer in case of removal:

public class ClassName: MonoBehaviour { public Transform[] waypoint; // The amount of Waypoint you want public float patrolSpeed = 3f; // The walking speed between Waypoints public bool loop = true; // Do you want to keep repeating the Waypoints public float dampingLook= 6.0f; // How slowly to turn public float pauseDuration = 0; // How long to pause at a Waypoint private float curTime; private int currentWaypoint = 0; private CharacterController character; void Start (){ character = GetComponent<CharacterController>(); } void Update (){ if(currentWaypoint < waypoint.length){ patrol(); }else{ if(loop){ currentWaypoint=0; } } } void patrol (){ Vector3 target = waypoint[currentWaypoint].position; target.y = transform.position.y; // Keep waypoint at character's height Vector3 moveDirection = target - transform.position; if(moveDirection.magnitude < 0.5f){ if (curTime == 0) curTime = Time.time; // Pause over the Waypoint if ((Time.time - curTime) >= pauseDuration){ currentWaypoint++; curTime = 0; } }else{ var rotation= Quaternion.LookRotation(target - transform.position); transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * dampingLook); character.Move(moveDirection.normalized * patrolSpeed * Time.deltaTime); } } } 

As for the locking the door I recommend making a state machine for your guards so that you can assign a close door state or something along those lines. Which you then fill with the data you want regarding it closing a door.