I open tubs with my finger under the lip and out of the way, or sometimes with a snake hook. With the snakes I have, if they take a swing as the tub opens, they don't actually leave the tub (as of now). I get a feeder in their face as fast as possible, and use my hands or the hook to guide them back into the tub if needed. My carpet pythons are much more of a handful if they come out looking for food than my BPs.