Wait for some time in between onMouseDown() function in unity2D

Question

I have built this 2D project in unity where you tap on blocks and they destroy using the onMouseDown() function. My problem is after tapping a block and it destroys, how can I make the player wait for a certain amount of time before he can tap on another block in the game. I have tried using PlayerPrefs and subtracting Time.deltaTime from a certain float variable but it did not work.

Note: all the blocks share the same destroy script!!!

Answer 1

float waitTime = 1.5f;
static float lastClickTime = float.NegativeInfinity;

void OnMouseDown ()
{
    float time = Time.time;
    if( time > ( lastClickTime + waitTime ) )
    {
        lastClickTime = time;
        DestroyThisBlock();
    }
}