What is the authenticity of the mentioned hadiths, in which books were they cited, and do they have a continuation?

The first Hadith, narrated by Anas (may Allah be pleased with him), indicates that among people, some are keys to good and locks against evil. Blessed is he whom Allah has made a key to good, and woe to him whom He has made a key to evil. As for the second Hadith, concerning the young man who came weeping to the Messenger of Allah (peace and blessings be upon him) and confessed his sins, the Messenger denied its authenticity due to indications of its invalidity in its chain of narration and text. Scholars have stated that it is not authentically attributed to the Prophet (peace and blessings be upon him) due to the absence of a sound chain of narration. The third and fourth Hadiths were not found in the compilations of Sunnah.