Don't know what the container looks like, but Child-Safety Stuff does me ead in >:(.....for metal containers I have to resort to my mini hacksaw &, like Tim, cover the open top with plaster.....for plastic push-down-&-simultaneously-twist ??? containers, found this neat trick...turn on CH!....get a radiator really hot, up-end container & position on radiator for an hour or so.....plastic then softens enough to push&twist, no probs....
Mainly I use this for ALDI's bleach ;D
grrrrrrrrrrrr !!!