Is there a way I can force my garage open from the outside?

I locked myself out of my detached garage. The remote to open it no longer works.

It's a really old garage and the opener is from 1999.

Trying to lift it obviously doesnt work. There's an emergency release you can activate with a key, but the keyhole is crammed full of old hard metallic paint that I can't get out.

Anything else I can do? Or do I have do smash the thing down?