Getting pass doors is often required of a security officer. The following information is given to inform or instruct that officer on how it must be done without getting hurt.
Interior doors
In the movies we always see the hero slam a door with his shoulder and opening it.
Reality is, that the shoulder does not have the needed force that is required to open an interior door. Interior doors required a kick or more to the locks area to enter the door. Use your foot, give that door a Bruce Lee kick at the area around the lock.
The alternative method to entering that door is look at the doorknob. Find the small hole or key hole. From your pen, yes that Bic pen in your front pocket. Remove the pen core, that long dark plastic or metal center that contains the ink well. Insert the pen core and push the locking mechanism. Turn the door knob. The door should open.
Exterior doors
The exterior door is constructed with sturdier materials. It was designed with the mind and thought of security. Such a door will require more force or skill. This type of door will often have a entry-lock for latching and a dead-bolt for security.
Give this door several or more well placed Bruce Lee kicks near the locks. It might take several kicks so keep going.
An alternative way to open the front door . Use a crowbar insert it between the door and the lock. Pry the crowbar back and forth until some entry is gained.
If the door hinges are facing you, use a flat edge screwdriver and a hammer to tap out the pins from the door hinges.
Types of force required
Interior doors require a minimum force compared to exterior doors. Interior doors are hollow and are made with poor construction materials.
In older homes you often find solid wood doors that required extra force above minimum force. They often require crowbars or other tools.
Solid Core doors require average force, where metal clad doors require above average force. Metal doors almost always require maximum force.
Other than brute force, we can refine door opening by professional lock-picking.
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