help needed

[COLLISION]

I'm trying to get the front calipers off my Dana 60,they are pretty rusty.I've taken the allen bolt out of the lower key, but I can't slide the key out or see a way to get the pads out of the caliper.
Which way does the key slide???
Do I have to get one of the pads out first?
I can only move the caliper about an 1/8" I think the piston is siezed.
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[4x4k20]

key will go out either way take a punch and hammer and tap it out also take a c-clamp and clamp it on the caliper to loosen it up this will allow it to come off easyer after you get the slide out