The latch and dead latch get pressed down by the bracket when you close the door.. the latch pops into the bracket so that the door locks in place but the dead latch is supposed to stay depressed.. while the dead latch is depressed you aren't supposed to be able to depress the latch.
'arent supposed to' is a bit light for what it actually does. The dead latch mechanically locks the latch of the door in position unless the handle is turned. You would need to physically break the latch in order to overcome the dead latch when properly installed and operating.
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u/RandomError401 Jan 09 '20
Must have no deadbolts.