What should i do?

Came home from school and saw someone leaning on my car talking to a group told him “can you please not lean on my car” he looks to be in high school he said “yea my bad” then i went inside 5mins later went outside and same kid with his buddies are back leaning on my car i told him “yo off the car this the second time” then he upped and left again I have a feeling he’ll be back a 3rd time idk wat to do im not tryna get into an altercation fr