A professional trained locksmith/security professional may do some or all of the following: install locks, deadbolts and other mechanical or electronic locking devices to safeguard homes, businesses, vehicles and other property. Locksmiths also may modify or repair such devices, rekey locks, make duplicate keys or cards, generate or program new keys/cards for locks whose keys/cards have been lost and respond to emergency calls to unlock vehicles, homes and businesses that have been locked accidentally, or whose locks have malfunctioned.