Fun Little Half-Elf Fact

[Bjarkmundur]

Appearently Half-Elves had this trait in AD&D 1e

1 in 6 chance to detect a concealed door when passing by
2 in 6 chance to detect a secret door when actively searching
3 in 6 chance to detect a concealed door when actively searching

and this in AD&D 2e

Merely passing within 10 feet of a concealed door (one hidden by obstructing curtains. etc.) gives the half-elven character a one-in-six chance (roll a 1 on Id6) of spotting it.
If the character is actively seeking to discover hidden doors, he has a one-in-three chance (roll a 1 or 2 on Id6) of spotting a secret door (one constructed to be undetectable) and a one-in-two chance (roll a 1, 2, or 3 on 1d6) of locating a concealed door.

as a fun little exercise I was wondering how to port this while still making it sound 5e and came up with this:

When you make a Wisdom (Perception) check as a part of the Search action treat rolls of 18-19 as if you had rolled a 20.

Which in turn had me think of things like

Jack of all Trades
When you roll a d20 for an ability check, treat all rolls of 1-4 as having rolled a 5.