---
title: "SecKeychainLock(_:)"
framework: security
role: symbol
role_heading: Function
path: "security/seckeychainlock(_:)"
---

# SecKeychainLock(_:)

Locks a keychain.

## Declaration

```swift
func SecKeychainLock(_ keychain: SecKeychain?) -> OSStatus
```

## Parameters

- `keychain`: A reference to the keychain to lock. Pass NULL to lock the default keychain.

## Return Value

Return Value A result code. See Security Framework Result Codes. The result code errSecNoSuchKeychain indicates that specified keychain could not be found. The result code errSecInvalidKeychain indicates that the specified keychain is invalid.

## Discussion

Discussion Your application should not call this function unless you are responding to a user’s request to lock a keychain. In general, you should leave the keychain unlocked so that the user does not have to unlock it again in another application.