HELP, problems with Serial.readString()

Why does not this work? Tried to use numbers insted
Edit: Sorry it does work;)

if (Serial.available()>0){
    Serial.println("Inni lokke");
    int ch = Serial.read();
    Serial.println(ch);
    if (ch == '1'){aapne();}
    if (ch == '2'){lukke();}
    if (ch == '3'){aapne2();}
    if (ch == '4'){lukke2();}
  }