Women after menopause experience vaginal constriction to the extent of having painful intercourse. Using lots of lube is a good idea. If that is not sufficient go in for vaginal dilators. You may need estrogen cream also which can be prescribed by your doctor, not a big issue. The condition I think is called vaginal atrophy.
I recommend the use of a warming lubricant that is design for "intimate" purposes.
These lubricants are very effective in overcoming the discomfort caused by vaginal dryness.