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In NEAR, you can lock an account by removing all its full access keys. This is useful to prevent any further transactions from being executed in the account’s name, effectively locking it. Removing all full access keys from an account will effectively lock it. When an account is locked nobody can perform transactions in the account’s name (e.g. update the code or transfer money).

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How to Lock an Account

near list-keys <dev-account>
# result: [access_key: {"nonce": ..., "public_key": '<key>'}]

near delete-key <dev-account> '<key>'

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Why Locking an Account

Locking an account brings more reassurance to end-users, since they know no external actor will be able to manipulate the account’s contract or balance.
Upgrading Locked ContractsWhile no external actor can update the contract, the contract can still upgrade itself, see this article for details