Help me for solve my code

Using Arduino Programming Questions
29

I have new idea but i cant

if (minute == 1)
    { 
 switch (lcd_key)               // depending on which button was pushed, we perform an action
case btnLEFT:
     {for(j=0;j<1;j++)
       lcd.setCursor(0, 1);
     lcd.print("      Timer     ");
     digitalWrite(led0, LOW); 
     digitalWrite(led1, LOW); 
     digitalWrite(led2, LOW);
     break;    
     }
   }

i want to press hold switch LEFT for 30 sec and then it is working go on if dont press hold it can't do that.