using UnityEngine;
using UnityEditor;
using System.Collections

public class AlignWithGround : MonoBehaviour {
      [MenuItem ("Tools/Transform Tools/Align with ground %t")]
      static void AlignWithGround () {
          Transform [] transforms = Selection.transforms;
          foreach (Transform myTransform in transforms) {
              RaycastHit hit;
              if (Physics.Raycast (myTransform.position, -Vector3.up, out hit)) {
                  Vector3 targetPosition = hit.point;
                  if (myTransform.gameObject.GetComponent<MeshFilter>() != null) {
                      Bounds bounds = myTransform.gameObject.GetComponent<MeshFilter>().sharedMesh.bounds;
                      targetPosition.y += bounds.extents.y;
                  }
                  myTransform.position = targetPosition;
                  Vector3 targetRotation = new Vector3 (hit.normal.x, myTransform.eulerAngles.y, hit.normal.z);
                  myTransform.eulerAngles = targetRotation;
              }
          }
      }
}

using UnityEngine;
using System.Collections;

public class PlayerKeys : MonoBehaviour {

   public bool cubeKey;

   // Use this for initialization
   void Start () {
    cubeKey = false;
    Debug.Log ("Player doesn't have a key!");
      
     
   }
     
   // Update is called once per frame
   void Update () {
     
   }
}

using UnityEngine;
using System.Collections;

public class Test : MonoBehaviour {

   public PlayerKeys PK;

   // Use this for initialization
   void Start () {   

   }
     
   // Update is called once per frame
   void Update () {
       
   }

   void OnMouseDown() {
     
    Destroy (this.gameObject);
    PK.cubeKey = true;
    Debug.Log ("Player got a key!");
   }   

}

PK.cubeKey = true;