An electromechanical lock actuation device intended to be mounted on one face of an opening movable relative to a fixed wall and to actuate a lock fitted to the opening and comprising a lock cylinder provided with a rotor and at least one primary lock fitted with a spring latch mechanically coupled to the rotor of the lock cylinder and capable of varying between a closed position in which the spring latch is deployed and an open position in which the spring latch is retracted, and with a spring biasing the spring latch towards the closed position and such that the passage from the closed position to the open position takes place in opposition to the action of the spring, the electromechanical lock actuation device comprising: - an external housing intended to be fastened on the face of the opening, - a drive mechanism movable in rotation relative to the housing and capable of being coupled to one end of the rotor of the lock cylinder, - an actuator comprising an electric motor and making it possible to electrically rotational drive the drive mechanism in a first direction of rotation adapted to displace the spring latch from its closed position to its open position and in a second direction of rotation opposite to the first direction of rotation, - a state determining element capable of delivering state information representative of a state of the opening between a first state adopted when the opening is closed relative to the fixed wall and a second state adopted when the opening is not closed relative to the fixed wall, - a programmable control unit processing the state information delivered by the state determining element and comprising a processor piloted by algorithms contained in the control unit such as next to a passage of the spring latch of the primary lock from its closed position to its open position through rotational driving via the actuator, the control unit imposes that: - the open position of the spring latch is maintained at maximum during a predetermined period known to the control unit thanks to a mechanical coupling between the spring latch and the actuator, - the spring latch is released from its open position by interrupting said mechanical coupling if, during the predetermined period, the state information is representative of the second state. - an external housing intended to be fastened on the face of the opening, - a drive mechanism movable in rotation relative to the housing and capable of being coupled to one end of the rotor of the lock cylinder, - an actuator comprising an electric motor and making it possible to electrically rotational drive the drive mechanism in a first direction of rotation adapted to displace the spring latch from its closed position to its open position and in a second direction of rotation opposite to the first direction of rotation, - a state determining element capable of delivering state information representative of a state of the opening between a first state adopted when the opening is closed relative to the fixed wall and a second state adopted when the opening is not closed relative to the fixed wall, - a programmable control unit processing the state information delivered by the state determining element and comprising a processor piloted by algorithms contained in the control unit such as next to a passage of the spring latch of the primary lock from its closed position to its open position through rotational driving via the actuator, the control unit imposes that: - the open position of the spring latch is maintained at maximum during a predetermined period known to the control unit thanks to a mechanical coupling between the spring latch and the actuator, - the spring latch is released from its open position by interrupting said mechanical coupling if, during the predetermined period, the state information is representative of the second state. - the open position of the spring latch is maintained at maximum during a predetermined period known to the control unit thanks to a mechanical coupling between the spring latch and the actuator, - the spring latch is released from its open position by interrupting said mechanical coupling if, during the predetermined period, the state information is representative of the second state.