A model number may be hard to come by if the door is locked but there are just a couple of styles you might have.
The most common is a Kenmore HE front load washer.
Across the bottom of the washer is an access panel that can be removed. See the image below for help with this. With the access panel removed and the washer unplugged from power you can reach up with your hand and feel for a small round tab at the bottom of the latch assembly. Pull this to manually unlock the door.
The Kenmore/Frigidaire washer doesn't have a release button.
I hope this information is helpful to you.
If a model number is available then that would be the best way to get an accurate answer to this questions.