These locks should ideally be deadbolt locks because they are a much better security option.
How to install high security door lock.
He wanted to be able to give to his customers the highest level of security without costing them the earth.
Their counterparts the doorknob locks should also be able to withstand 800 000 cycles 6 strikes against the door and a weight test of 360 pounds.
High security door locks will have hardened steel bolts that withstand bludgeoning attacks kicks battering rams sledge hammers shoulder strikes etc used against the door.
High security door locks with strong bolts will also be resistant to cutting.
For extra security install one near the bottom of the door as well attach with screws sunk into the door.
Without strength these attacks would bend or snap a bolt severely enough that it fails.
Look into keyed entry door knobs also called privacy knobs portable door locks or top of door locks.
High security lock pin installation locks bump key bumping pick picking locksmith keys.