From Longman Dictionary of Contemporary Englishopen sesameˌopen ˈsesame noun [singular] British English SUCCEED IN DOING somethingan easy way to achieve something that is usually very difficultopen sesame to A university degree isn’t always an open sesame to a good job.
Examples from the Corpus
open sesame• One aspect after another yields to the open sesame of the envy theory.open sesame to• He discovered that having wealth wasn't an open sesame to gaining respect. 