Instantiating an object only once within Update()

This is what i have so far. if i collect some coins they get stored in the GameBrain script. when i make it to a chest i can store the coins in there and that value gets stored in the GameBrain at coinsStored. i have that all working fine i even had the object instantiating after i stored 10 coins. its when i tried to make it happen only once by adding the if(UnlockComplete = false)statement. (i know there is nested loops i have fixed that but still no change.) that i have issues with it not spawning at all.

public class UnlockFloor : MonoBehaviour {

 public GameObject obj;                 //passed from unity
 public float UnlockAmout = 10f;         //usually set by unity 10 is default
 private bool UnlockComplete = false;    //Stops a MillionBajillion "Things" from spawning


 void OnDrawGizmosSelected() {            //A Gizmo so i can see the "Things" spawner
     Gizmos.color = new Color(1, 0, 0, 0.5F);
     Gizmos.DrawCube(transform.position, new Vector3(1, 1, 1));
 }
 

 void Update () {
     if(GameBrain.coinsStored > UnlockAmout) {
         if(UnlockComplete = false){
             UnlockTheThing();
             UnlockComplete = true;
         }
     } 
 }
 //Unlocks the "Thing" in question set by obj
 void UnlockTheThing(){
     Instantiate(obj, transform.position, Quaternion.identity);
 }

}