Can we use the sawstop concept for metallic doors as well for home?

Is it possible to apply the Sawstop concept where the system induces small current and monitors changes when human finger is inserted? If not what are the nest ways [for metallic doors that closes automatically like elevator]

Do you mean something like capacitive sensing?

Or touch switiches?

I think Sawstop uses capacitive sensing.

It's not the sensing that's the problem, it's what you're going to do with it - and then making it highly reliable!

Have a look at this.