If you are unable to open the lock
Don't just keep trying new keys
Instead ensure that you are
Standing at the right door!
Everybody is fighting their own battles, everyone is busy in their own hassles. So if they do not answer your calls or they skip to revert on the text you drop, if they forget to wish you on special occasions or if they fail to give you due attention.
Just ignore my dear and accept them with their flaws. It is the time for you to show your affection and concern, may be they are tired and broken and awfully looking for only one such Person!