Where you have the press key, you add another press key to the same event, it kind of attaches to it. What this means is that both must be true to run the action. You cannot do this with trigger events so 'key pressed' will not work but you can use 'key is down' so both keys must be down.
Also probably worth to note while both keys are down it would keep running the actions so you might want to also add a trigger once condition to the same event and then it runs only once.