Just lock the door

Simply use the default "activate" key with modifier keys to lock the door.

There are already some mods that allow you to lock doors, but I implemented my own without any spells, smaller abilities, or suitable items (inspired by LE SHOL's "Keep Your Sweet Rolls Safe - KYSRS Simple" locking doors, which I found script-heavy). In other words, I tried to make it look more native.

Another solution is LockMaster, which is also good and has more features, but works differently.

Just press the modifier key (Shift by default or a custom key code that can be set via the SimplyLockDoorsKeyCode global variable) using the E key (or the key you set to activate the thing).

Yes, press Shift + E and the door will be locked if you have the key.

Unfortunately, until you change the crosshair target (move the crosshair back from the door and realign it), you can still see the "locked" icon, which is a limitation of the game. But you can still tell if the door is locked because a sound plays when you lock the door (and a "click" sound when you try to lock the door without a key).

SKSE required

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There are already some mods that allow you to lock doors, but i implemented my own one, without any spells, lesser powers or equipable items (inspired by LE SHOL's Keep Your Sweet Roll Safe - KYSRS Simple lock door, which i found pretty script heavy). In other words, i tried to make it feel more native.

An alternative solution is LockMaster, which is not bad too and has more functionality, but works differently.

Just use the E key (or what you have set to activate things) with the modifier key pressed (Shift by default, or your custom keycode you can set via theSimplyLockDoorsKeyCode global variable).

Yep, Shift + E, and if you have the key, the door will be locked.

Unfortunatelly you still can see the "locked" icon until you change your crosshair target (move the crosshair from the door and back on it), it's a game limitation. But you still may be sure that door is locked, as there is a sound that will be player when you lock a door (also there is a fail "click" sound when you try to lock a door without the key).

Requires SKSE