There is a tab on the bottom of the door lock assembly that you can pull until it clicks to manually unlock the washer door. To access this tab, unplug the washer and remove the bottom front service panel as shown in the first image below. Once the door is unlocked, you may be able to close it and then drain the washer to finish the cycle if there is no damage to the plunger or the door lock assembly. If there is damage to the door lock assembly, you can access it (with the washer still unplugged) by using the procedure in the link.
You can order parts from the Sears PartsDirect website if needed.
When replacing the spring clamp on the boot, start working the retainer into the lip on the door opening at the opposite end of the spring. Pull the spring out as you work the clamp into place evenly up both sides of the door opening. Significant force will be needed to work the clamp back into place. I recommend wearing gloves during this process.
Once you get the washer door lock working again, test the washer in the spin mode when it is empty. Monitor on the first cycle with laundry in it to make sure that there is no damage to the spin basket or tub bearing.
When you push the washer and dryer back into place, get help and carefully push at the very bottom of the washer. Be extremely careful. You may need to use a dolly to carefully lift the washer up slightly as you push it back into place. http://media.fotki.com/1_p,wkkwfqgkqskwbtqxgtqsskgwtqkq,vi/kwrswktksxkqbkwwwtb/1/1303472/5961857/image48186img-or.gif