2004 Hyundai Elantra Owner's Manual - Page 170

3 WHAT TO DO IN AN EMERGENCY 12 IF YOU LOSE YOUR KEYS D120A01A-AAT If you lose your keys, many Hyundai dealers can make you a new key if you have your key number. If you lock the keys inside your car and you cannot obtain a new key, many Hyundai dealers can use special tools to open the door for you.