Front calipers not releasing

years ago, I bought a "1 man bleeder" tool. It is kind of tubular pogo stick like contraption with a flat collar that locks in any place along the tube so that it will push down on the brake pedal and hold when the collar is propped against the front of the front seat bolster. As I recall it wasn't that expensive but it did require a lot of up & down on my part. I was much younger then, hahaha.
Thats not the intended purpose of that tool and will not wok for bleeding brakes as far as I am concerned. It's use is to lock the brakes while measuring caster. Works for checking brake lights too. Brake bleeding? Nope