Open a locked (broken) washing machine
Because your electronics are probably fried you can just pry it open. 

The cost of replacing the electronics will probably be more then it is worth to fix and you can get a used one cheaper. 

But if want to make sure you can pay to have an appliance repair person come out and tell you what it would cost to repair. 

The latch in most cases is just a plastic piece that is being held by the electronic mechanism. 

I would just pry and break the plastic locking mechanism.

A big crowbar would do the job.