Break the glass of the car window, the alarm will sound, but will be easily disabled with the keys.
Find another way to get in your car.
You are on a camping trip and you wake up in your tent in the middle of the night. You hear noises outside of the tent, and you look outside to invesigate the noise. You see dozens of creatures with red eyes and you quickly dip back inside your tent. You wait in fear and hear something run by, you look outside again to see a deer running from one of the creatures. You then see dozens of the creatures jump onto the deer and kill it. You need to make it to your car to escape, but any noise would make you a target. You see the pack of creatures run towards another object moving in the shadows. You take this as your chance to get to your car and you bolt out of your tents and towards your car. You reach your car and pull the door handle, it was locked. You check your pockets for your keys and don't find them. You look into the car and spot the keys in your cupholder. You panic when you realize this, but you snap out of it and attempt to make up a plan.