Custom sound question

I hope this is the right place. I’m just looking for someone smarter than me with AV 🤣 I just bought myself a 2010 Camaro in yellow (the classic Bumblebee) and I’m looking to do a very specific type of modification. I want to be able to install a switch of some sort that, when I lock the car, it plays whatever sound I want. The car has the typical horn honk but I’d like a sound clip of the transformers well… transforming. Im thinking I need some type of switch that activates when power is sent to the door locks and then a device the house the sound and a speaker. But I’m not sure about any specifics or if it’s even possible. I appreciate all the help! Excited to have a new (to me) car and make it my own!