I'll anticipate your Catholic answer to include some plea to purgatory for 'cleansing' so the person once at the finish line of salvation trail can then eventually enter Heaven. Is that an accurate portrayal of how one who does not forgive others yet is following sacramental trail arrives at salvation entry into Heaven?
How can there be forgiveness without salvation or salvation without forgiveness?
The better question is whether the person denying forgiveness is denied salvation.