Car will start without key

Assuming you have not changed anything lately you could get some lock graphite and spray a bit in the lock cylinder ( graphite lock lube can be messy take precautions, think toner from a laser printer). My guess is that the pins are stuck in the unlocked position. The graphite might not fix the issue if grease or other types of spray lube was sprayed into the cylinder and has now gummed up causing the pins to stick.

I am not familiar with how that particular cylinder is removed but if it is relatively easy, remove it and clean the pins etc ( DO NOT DISASSEMBLE the cylinder itself or you will have small springs and pins all over the place) a good cleaning and a proper lube typically NOT a grease.

If you need a quick solution some WD40 or similar spray lube can be sprayed into the cyl but it will only be more of a problem down the road.