With a little research you can figure out what is causing your door to be so difficult.
Internal house door wont open.
A door knob or door handle uses a spring loaded latch.
Flip the key and open the door.
The turning of the handle retracts the latch by pulling on the spring and compressing it.
The part of a doorknob that you grasp with your hand connects to a rod that extends though the door to the knob on the other side.
Spray the door key with a graphite based lubricant.
Rather than trip over a brick to prop a door open that won t stay open you can fix it with a few minutes of time and a few tools.
When a door slams shut it can be a pesky problem on a daily basis.
Slide the key in the lock and tap lightly on the key to lubricate the inside of the lock.
In the resting state of the lock the spring is extended.
How to fix a door knob that turns but doesn t open.
How to fix a door that won t stay open.
When the door knob is locked the handle will not turn which keeps the latch from retracting.
A door that won t stay open is one of the most frustrating problems to have around the house.