Can't get Pass. door open

Can you move parts on the actual door mechanism itself?--
trace the one from your inside door handle or the push button-- move it directly--(what does the latch do)

when you have the latch in the open position -- strike the door as close as possible to the striker area. A foot or something non denting is best.
a friend would be helpful.

Also-- if you have coated the mechanism in the door -- lightly tap on it-- place a drift on it And tap the flat spots-- don't bend anything.

Most likely this mechanism is rusted shut-- could be light rust could be major, until door is open-- can't tell.

Lawrence