Digispark left click help

Would anyone here know how to code a digispark to simulate a left click when ever I press the button I have soldered to pin 0 and ground? The code I found doesn't seem to work, it keeps sending "a" and will send them more if I press the key. `#include "DigiKeyboard.h"

void setup() {
pinMode(0, INPUT);
}

void loop() {
if(digitalRead(0)==LOW){
DigiKeyboard.sendKeyStroke(KEY_A);
}
delay(500);
}`

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Try pin 2 and use:
pinMode(2, INPUT_PULLUP);

A "Left Click" is a MOUSE thing, not a KEYBOARD thing. Do they provide a Mouse library?

#include <DigiMouse.h>

void setup() {
  pinMode(2, INPUT);
  DigiMouse.begin();
}

void loop() {

  if(digitalRead(2)==LOW){ 
    DigiMouse.leftClick();
    DigiMouse.delay(500);
  }
}
``` I have my key soldered to pin 2 and ground know