You can try bracing one foot against the frame and pulling hard.
To open a door easily the handle should be fixed.
Look for the door hinges and select a lever in which the handle points toward the hinges.
Using an awl or small screwdriver push the button in all the way and at the same time pull off the handle.
However before you begin to do this you should take the time to adequately determine which type of door knob you have in place.
In order to tighten the screws in a loose door knob or loose door handle you need to work on removing your loose door knob or loose door handle from the door that it is currently on.
In most cases a door that either won t stay shut or open is the result of the pins or the shims behind the hinges needing adjustment both of which are relatively easy to handle.
Use a spatula or putty knife to get a little space between the door and the frame then use a combination of wiggling and brute force to get the door open.
Tighten a loose door handle photo 1.
If the hinges are on your right you need a right handed lever.