Opening up yourself and letting out all the accumulated knowledge and experience stored within.
Getting past a tough barrier to gain something with substantial sustenance. This includes breaching any obstacles you’ve placed between yourself and the world, or those behind which other people hide (see Armor).... The Language of Dreams
Finding a can opener may represent that you have discovered an important tool for cpening up someone to your way ol thinking. Difficulty in opening a can may comment on difficulties in discovering the right ingredients to living a fulfilled life, or that you feel frustrated, or that you are unable to open up to someone else.