Never happens. Only entrusting ourselves to Christ’s complete payment for our sins eliminates eternal punishment.
Unfortunately our blessed Lord disagrees with you:
[Jesus] said to them again, “Peace be with you. As the Father has sent me, so I send you.” And when he had said this, he breathed on them [the Apostles] and said to them, “Receive the holy Spirit. Whose sins you forgive are forgiven them, and whose sins you retain are retained.”
--Jn 20:21-23
In this case, you confuse the timeframe of events and ignore the rest of scripture. Because of these errors, you minimize the efficacy of the Blood of Christ, the meaning of His Gospel of His grace, and make His forgiveness a religion of works.
There is no eternal forgiveness through a man, only by accepting what the Son of Man did through His suffering, blood, death and resurrection.