In 5e, there is no default procedure for secret doors afaik.
I ask my players to describe exactly what they are doing, and if they are doing a thing that might reasonably find the secret door, I'll let them find it and describe how the opening mechanism is hidden (so they could use again if they want). If they are doing something sort of close, then I'll let them roll perception or investigation.
How do you handle?
my groups have fallen into "If the DC is less then the passive perception of a PC they auto see it if they are not rushing" and "Actively looking for one is PC choice of better of Perception or Investigation"If they are "searching" the area where the door is, a Wisdom (Perception) check to find it, an Intelligence (Investigation) to figure out how open it. If they aren't in the right area, they still roll (for the sake of appearances), but automatically fail.
I had a similar question a few months ago. You might find that thread useful:
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D&D 5E - Secret Doors
I'm running an adventure with a lot of secret doors right now, and I'm struggling with how to keep them from becoming monotonous on the one hand or trivial on the other. I don't want to slow down the game while the players go over every inch of wall, but just allowing the characters with high...www.enworld.org
And here are some older threads with more advice:
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D&D 5E - How do you do secret doors?
I'm gearing up to run Caverns of Thracia converted to 5e in the Summer and I really don't have an idea on how to do secret doors in a meaningful way. In the old days it was just a d6 roll whenever the party passed on, and I suppose the logical continuation of that would be a perception check now...www.enworld.org
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D&D 5E - The Art of the Secret Door
I posted this a long time ago elsewhere, but I felt like it was worth discussing again with the 5e release. [1] Do you design secret doors with mechanisms which require specific verbal instructions from your players to discover and unlock? If so let us hear the details of any you devised that...www.enworld.org
5 editions of D&D, and this is what we get?There is, actually, in the DMG, pp. 103-104.
Secret Doors
A secret door is crafted to blend into the wall that surrounds it. Sometimes faint cracks in the wall or scuff marks on the floor betray the secret door’s presence.
Detecting a Secret Door. Use the characters’ passive Wisdom (Perception) scores to determine whether anyone in the party notices a secret door without actively searching for it. Characters can also find a secret door by actively searching the location where the door is hidden and succeeding on a Wisdom (Perception) check. To set an appropriate DC for the check, see chapter 8.
Opening a Secret Door. Once a secret door is detected, a successful Intelligence (Investigation) check might be required to determine how to open it if the opening mechanism isn’t obvious. Set the DC according to the difficulty guidelines in chapter 8.
If adventurers can’t determine how to open a secret door, breaking it down is always an option. Treat it as a locked door made of the same material as the surrounding wall, and use the guidelines in the Running the Game section to determine appropriate DCs or statistics.