Once you pressed button, cant press again?

Im making a map with 4 buttons. Each button plays a different song. How can I make it so that once one button is pressed, the 3 buttons are locked and cannot be activated?

OnPressed, button_1, Lock
OnPressed, button_2, Lock
OnPressed, button_3, Lock

Did you really need to make a thread for that? Post questions like this in the Question Megathread.

I will next time, but thank you for your response.