how can i open door of washing machine?

check the drive belt has not snapped ,some of hoover machines have a bowden cable that has a flipper that when the drum stops the flipper rests against the belt causing tension so when you push the button the cable tightens and door opens

ex hoover guy
September 2012

the door interlock should de activate in about 90 seconds you have either a sticking lock or the cable from pushbutton has become dislodged, try giving it a thump around the lock area it may just release if so replace interlock when open, motor replacement is not revelant.

keymatic
September 2012

try unplug it for 2 0r 3 hours, to depower it, and then try it,

l
September 2012