A black hole crushes time into nothing and then spits out the remains of time as x-rays. Pressure cookers stop a liiiiiitle bit before that.
It's true, a pressure cooker uses heat and pressure to cook your food a bit faster than you might otherwise expect. But don't take that to mean the food's gonna come out mushy or squished. It's not doing anything fancy with space or gravity. It's just puttin' a little pressure on your dinner so things go more efficiently. That's all.