The GUI does not open when adding the function to run the script on keypress?

Question

PyQt

I made a GUI using PyQt5, and when I added lines to run a script on a button click, the GUI stopped working for me, I just started learning Python, so I can’t understand what the problem is.
I will be very glad if you help me!
Lines to run the script on keypress

key = 'F7'

while True:
    if keyboard.is_pressed(key):
        keyboard.write('Привет')

All code

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow, QMessageBox
import time
import keyboard

import sys


class Ui_ChatSpamer(QMainWindow):
    def __init__(self):
        super(Ui_ChatSpamer, self).__init__()

    def setupUi(self, ChatSpamer):
        ChatSpamer.setObjectName("ChatSpamer")
        ChatSpamer.setEnabled(True)
        ChatSpamer.resize(500, 430)
        ChatSpamer.setMinimumSize(QtCore.QSize(500, 430))
        ChatSpamer.setMaximumSize(QtCore.QSize(500, 430))
        font = QtGui.QFont()
        font.setBold(False)
        font.setWeight(50)
        ChatSpamer.setFont(font)
        ChatSpamer.setStyleSheet("")
        

key = 'F7'

while True:
    if keyboard.is_pressed(key):
        keyboard.write('Привет')


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    ChatSpamer = QtWidgets.QMainWindow()
    ui = Ui_ChatSpamer()
    ui.setupUi(ChatSpamer)
    ChatSpamer.show()
    sys.exit(app.exec_())

The GUI code didn't fit, so I replaced it with a simple example.