Sooner

As you twiddle your thumbs, no plan to get rid of the bellboy comes to you. Then you hear an alarm. There it is again! The fire alarm?

Worse. The whistle.

You unlock and open the door, and there is the bellboy playing with the whistle. "It is quieter when you blow it yourself!" he chuckles, and you lunge at it as he attempts to blow it again.