Garage door locks can usually be broken or jimmied open with ease. On older garage doors (especially when the garage is not attached to the house), a sturdy hasp and padlock will provide adequate security.
Overhead doors which tilt or roll up can be secured with padlocks or bolts installed in the centre of the tracks 1/4" above a roller with the door closed. This should be done to both tracks to prevent rollers from moving, even if the outer lock is broken.
Hasps for padlocks should be installed so that no screws are visible when the hasp is closed.
Padlocks should be heavy-duty with hardened shackles and heavy steel or laminated casings.