Two Philadelphia teens who were court-ordered to a Delaware County residential school probably won't get time off for good behavior after they allegedly stole their counselor's keys early yesterday, then made off with his car.

The two teens, who were sent to the Glen Mills School in Thornbury Township, stole their counselor's car keys from his gym bag while he was doing bed checks about 2:15 a.m., police said.

The teens, ages 16 and 17, then managed to escape the facility unnoticed, find the counselor's 2003 gold Toyota Corolla and drive away in it, State Police said.

The two were still on the lam last night.

State Police spokeswoman Trooper Rosemary McGuire said she was not able to divulge the teens' identities or say what crimes had landed them at the school for court-adjudicated youth.

McGuire said that the school is not gated and is not a detention center but that there are security guards and bed checks.

A school spokesman said of the incident: "Our school has no comment at all whatsoever."

The Glen Mills School's website says it's a residential facility for 15- to 18-year-old boys who have been ordered there by the courts. It's on about 800 acres and is the oldest school of its kind in the country, the website said.