If you are really worried, put something heavy, such as a dresser in front of the door. Just remember you'll need to move it in order to get out so don't make it TOO heavy.
How can I protect my home against intruders whilst I am sleeping at night?
Put more than one lock on the doors.
Live in a missile silo.
Get skunky
Get a guard dog, goose, or gun.
https://lifehacker.com/5887264/how-to-cleverly-secure-your-home-against-intruders
(Or, get a goose or a dog and train him to fire the gun.)
make sure all of your doors are locked.
Buy a skunk.
CCTV, alarm system, security lights and a dog.