Added DoorScript and KeyScript, started DoorSceneScript

Assets/Scripts/DoorSceneScript.cs

+using UnityEngine;
+using System.Collections;
+
+public class DoorSceneScript : MonoBehaviour {
+
+	// Use this for initialization
+	void Start () {
+	
+	}
+	
+	// Update is called once per frame
+	void Update () {
+	
+	}
+}

Assets/Scripts/DoorSceneScript.cs.meta

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Assets/Scripts/DoorScript.cs

+using UnityEngine;
+using System.Collections;
+
+public class DoorScript : MonoBehaviour {
+
+    public enum State
+    {
+        closed,
+        open,
+        locked
+    }
+
+    public KeyColor doorColor;
+    public State state;
+    private Collider2D collider;
+
+    void Start()
+    {
+        collider = GetComponent<Collider2D>();
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        if(state == State.closed)
+        {
+            //change sprite to be a closed door sprite
+            collider.enabled = true;
+        }
+        if(state == State.locked)
+        {
+            //change sprite to be a locked door sprite
+            collider.enabled = true;
+        }
+        if(state == State.open)
+        {
+            //change sprite to be an open door sprite
+            collider.enabled = false;
+        }
+    }
+
+    void unlockDoor()
+    {
+        if(state == State.locked)
+        {
+            state = State.open;
+        }
+        Debug.Log("Door Unlocked");
+    }
+
+    void OnCollisionEnter2D(Collision2D coll)
+    {
+        if(coll.gameObject.tag == "Player")
+        {
+            if (state == State.locked)
+            {
+                KeyScript[] keyScripts = coll.gameObject.GetComponents<KeyScript>();
+                foreach (KeyScript key in keyScripts)
+                {
+                    if (key.color == doorColor)
+                    {
+                        unlockDoor();
+                        break;
+                    }
+                }
+            }
+        }
+        
+    }
+}

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Assets/Scripts/KeyScript.cs

+using UnityEngine;
+using System.Collections;
+
+public class KeyScript : MonoBehaviour {
+
+    public KeyColor color;
+
+	// Use this for initialization
+	void Start () {
+
+	
+	}
+	
+	// Update is called once per frame
+	void Update () {
+	
+	}
+
+    void OnCollisionEnter2D(Collision2D coll)
+    {
+        if(coll.gameObject.tag == "Player")
+        {
+            KeyScript ks = coll.gameObject.AddComponent<KeyScript>();
+            ks.color = this.color;
+        }
+    }
+
+    }
+
+public enum KeyColor
+{
+    red,
+    blue,
+    green,
+    purple,
+    yellow,
+    orange
+}

Assets/Scripts/KeyScript.cs.meta

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