need help for Interrupts

Projects Programming
4

i try this but it break code.

#include "LedControl.h"
LedControl lc=LedControl(10,9,8,1); 

int keypress ;
const int buttonPin = 3; 
void setup()  
{ 
  pinMode (buttonPin, INPUT);
  pinMode(2, INPUT);
  attachInterrupt(0, pause,CHANGE); 
  lc.setIntensity(0,8);
  lc.shutdown(0,false); // need to take MAX out of shutdown
  lc.clearDisplay(0);  
  delay(10);
}  

void loop()  
{ 
  
  for(int row=0;row<4;row++) { 

    for(int col=0;col<8;col++) { 
      delay(100); 
      lc.setLed(0,col,row,true); 
      if(keypress==1){ 
        break;
        
      }
    } 
  }        
        keypress = 0;
   
  lc.clearDisplay(0);

}

void pause()
{
  keypress = 1;
 }